dropdown content not autoresize.

[Ruslan]

I need to RadDropDownButton when opening automatically scales the content and if it falls off the screen scroll bar appears and the boundaries of content aligned along the boundaries of the browser window, how to do this I have included in the scrolling content runs outside the browser window before him could not reach.Sorry, my english some bad.

[Lancelot]

Hi Ruslan,

I am not completely clear on what control you are referring to, but I will assume you mean the RadComboBox.  If yes, then you are trying to solve a problem where the content is longer than the box and you want it to scroll? After reading my answer, you can check out this link to learn more on controlling the appearance of the RadComboBox

I've created an example of a ComboBox (at the end of this post) for you that demonstrates the ability to indiviually control each dropdown list items. Look through it and see the Comments I've placed for you. Copy and paste this code into your project to see what I've done for you. Notice in the third item, I have explicitly set it to show a scrollbar when the content becomes larger than the width. I think this is what you are looking for.


If this isn't what you were looking for or if you are talking about a different control, let me know. If you provide your code, I will be able to help you find a solution.

Good Luck,
Lancelot

<Grid x:Name="LayoutRoot">

        <!-- Here I've inserted a RadComboBox, I've also set some initial properties-->
        <telerik:RadComboBox Margin="211,59,179,0"
                             VerticalAlignment="Center"
                             HorizontalAlignment="Center"
                             MaxDropDownHeight="225"
                             MinWidth="100"
                             ScrollViewer.HorizontalScrollBarVisibility="Auto"
                             ScrollViewer.VerticalScrollBarVisibility="Auto"
                             IsMouseWheelEnabled="False"
                             Text="Top Text Title"
                             EmptyText="empty">

            <!-- This is the default style, it uses the parent container's properties such as width and height -->
            <telerik:RadComboBoxItem Content="First list Item"/>

            <!-- You can explicitly change and set the height/width of the list item by doing this-->
            <telerik:RadComboBoxItem Content="Second List Item"
                                     Height="100"
                                     Width="100"/>

            <!-- Or you can do what I've done here. I set a Minimum width and height and then set the scrollBar to "Auto"-->
            <telerik:RadComboBoxItem Content="Third list item"
                                     ScrollViewer.HorizontalScrollBarVisibility="Auto"
                                     ScrollViewer.VerticalScrollBarVisibility="Auto"
                                     MinHeight="50"
                                     MinWidth="200"/>


        </telerik:RadComboBox>

    </Grid>

 

[Ruslan]

Thanks, I needed to make the same decision but for RadDropDownButton, I attached a screenshot, which is drawn too long, issues a drop-down element of the tree, and we should limit it like that.

[Lancelot]

Hi Ruslan,

After playing with your idea for a while, I think it would be better for you to use a RadComboBox and set a maximum height for the ComboBoxItem.  That way you can still have the same appearance but when the user expands the year, it would stay withing the maximum height of the Item, but offer them a vertical scroll bar. I've written an example below for you.

The ComboBox hold the treeview, for which you can bind your data to (I'm sorry I cant translate the text in the image but they look like dates). So the user can drop down the box to get to the RadTreeView. When they expand the RadTreeView, the scrollBar will appear to right if the list is too long for your maximum height. When the user makes the selection inside the TreeView, the comboBox will collapse automatically.

Good luck,
Lancelot

RadTreeView inside a RadComboBoxItem with a set max height and scrollbar enabled

<Grid x:Name="LayoutRoot">

        <!-- Main RadComboBox, set the scrollbar to Auto in here-->
        <telerik:RadComboBox Margin="256,8,184,0"
                             VerticalAlignment="Top"
                             MaxDropDownHeight="225"
                             MinWidth="100"
                             ScrollViewer.HorizontalScrollBarVisibility="Auto"
                             ScrollViewer.VerticalScrollBarVisibility="Auto"
                             IsMouseWheelEnabled="False"
                             Text=""
                             EmptyText="Main Drop Down Button" d:LayoutOverrides="Width">

            <!-- Put the tree view inside the ComboBoxItem, and set the item to have a maximum height. This will be the largest size you want the DropButton to have  -->
            <telerik:RadComboBoxItem MaxHeight="400">

                <!-- Now insert your Treeview here like you have in the RadDropButton-->
                <telerik:RadTreeView Height="250" Margin="0,0,42,0" Width="150">
                    <telerik:RadTreeViewItem DropPosition="Inside" Header="Item 1" IsTabStop="True" TabNavigation="Once" Margin="0,0,-26,0">
                        <telerik:RadTreeViewItem Header="RadTreeViewItem" Height="100" Width="100"/>
                    </telerik:RadTreeViewItem>
                </telerik:RadTreeView>

            </telerik:RadComboBoxItem>
        </telerik:RadComboBox>

    </Grid>

[Ruslan]

<telerik:RadDropDownButton
                           xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                           xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                           xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
                           xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
                           xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"
                           x:Class="KPIVisualStudio.Dashboard.DashboardEditor.CustomControls.Views.Filter"
                           mc:Ignorable="d"
                           HorizontalAlignment="Stretch"
                           VerticalAlignment="Stretch" Foreground="Black"
                           HorizontalContentAlignment="Stretch"
                           VerticalContentAlignment="Stretch" DropDownOpened="PartHB_DropDownOpened"
                           x:Name="PartHB"  Background="#8AFFFFFF" BorderBrush="#99808080">
    <telerik:RadDropDownButton.Resources>

        <SolidColorBrush x:Key="ControlOuterBorder_Normal" Color="#FF848484"/>
        <LinearGradientBrush x:Key="ControlBackground_Normal" EndPoint="0.5,1" StartPoint="0.5,0">
            <GradientStop Color="#FFFFFFFF" Offset="0"/>
            <GradientStop Color="#FFDCDCDC" Offset="0.50"/>
            <GradientStop Color="#FFADADAD" Offset="0.50"/>
            <GradientStop Color="#FFD4D4D4" Offset="1"/>
        </LinearGradientBrush>
        <SolidColorBrush x:Key="ControlForeground_Normal" Color="#FF000000"/>
        <CornerRadius x:Key="ControlOuterBorder_CornerRadius">1</CornerRadius>
        <SolidColorBrush x:Key="ControlOuterBorder_Checked" Color="#FFFFC92B"/>
        <SolidColorBrush x:Key="ControlInnerBorder_Checked" Color="#FFFFFFFF"/>
        <LinearGradientBrush x:Key="ControlBackground_Checked" EndPoint="0.5,1" StartPoint="0.5,0">
            <GradientStop Color="#FFFFDCAB" Offset="0"/>
            <GradientStop Color="#FFFFD18F" Offset="0.5"/>
            <GradientStop Color="#FFFE9227" Offset="0.5"/>
            <GradientStop Color="#FFFFD74E" Offset="1"/>
        </LinearGradientBrush>
        <SolidColorBrush x:Key="ControlElement_Normal" Color="#FF000000"/>
        <SolidColorBrush x:Key="ControlOuterBorder" Color="#FF848484"/>
        <SolidColorBrush x:Key="ControlBackground" Color="#FFFFFFFF"/>
        <SolidColorBrush x:Key="ControlOuterBorder_Focused" Color="#FFFFC92B"/>
        <SolidColorBrush x:Key="ControlBackground_Focused" Color="Transparent"/>
        <SolidColorBrush x:Key="ControlInnerBorder_Focused" Color="Transparent"/>
        <SolidColorBrush x:Key="ControlOuterBorder_MouseOver" Color="#FFFFC92B"/>
        <LinearGradientBrush x:Key="ControlBackground_MouseOver" EndPoint="0.5,1" StartPoint="0.5,0">
            <GradientStop Color="#FFFFFBDA" Offset="0"/>
            <GradientStop Color="#FFFEEBAE" Offset="0.50"/>
            <GradientStop Color="#FFFFD25A" Offset="0.50"/>
            <GradientStop Color="#FFFFFBA3" Offset="1"/>
        </LinearGradientBrush>
        <SolidColorBrush x:Key="ControlInnerBorder_MouseOver" Color="#FFFFFFFF"/>
        <LinearGradientBrush x:Key="ControlOuterBorder_Pressed" EndPoint="0.5,1" StartPoint="0.5,0">
            <GradientStop Color="#FF282828"/>
            <GradientStop Color="#FF5F5F5F" Offset="1"/>
        </LinearGradientBrush>
        <LinearGradientBrush x:Key="ControlBackground_Pressed" EndPoint="0.5,1" StartPoint="0.5,0">
            <GradientStop Color="#FFFFDCAB" Offset="0"/>
            <GradientStop Color="#FFFFD18F" Offset="0.5"/>
            <GradientStop Color="#FFFE9227" Offset="0.5"/>
            <GradientStop Color="#FFFFBA74" Offset="0"/>
        </LinearGradientBrush>
        <LinearGradientBrush x:Key="ControlInnerBorder_Pressed" EndPoint="0.5,1" StartPoint="0.5,0">
            <GradientStop Color="#FFB69A78"/>
            <GradientStop Color="#FFFFE17A" Offset="0.126"/>
        </LinearGradientBrush>
        <SolidColorBrush x:Key="ControlOuterBorder_Disabled" Color="#FF989898"/>
        <SolidColorBrush x:Key="ControlInnerBorder_Disabled" Color="Transparent"/>
        <SolidColorBrush x:Key="ControlBackground_Disabled" Color="#FFE0E0E0"/>
        <SolidColorBrush x:Key="ControlElement_Active" Color="#FF000000"/>
        <Style x:Key="RadDropDownButtonStyle1" TargetType="telerik:RadDropDownButton">
            <Setter Property="IsOpen" Value="false"/>
            <Setter Property="BorderThickness" Value="1"/>
            <Setter Property="BorderBrush" Value="{StaticResource ControlOuterBorder_Normal}"/>
            <Setter Property="Background" Value="{StaticResource ControlBackground_Normal}"/>
            <Setter Property="Foreground" Value="{StaticResource ControlForeground_Normal}"/>
            <Setter Property="HorizontalContentAlignment" Value="Center"/>
            <Setter Property="VerticalContentAlignment" Value="Center"/>
            <Setter Property="Padding" Value="3"/>
            <Setter Property="CornerRadius" Value="{StaticResource ControlOuterBorder_CornerRadius}"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="telerik:RadDropDownButton">
                        <Grid>
                            <Border x:Name="OuterBorder"
                            BorderBrush="{TemplateBinding BorderBrush}"
                            BorderThickness="{TemplateBinding BorderThickness}"
                            Background="{TemplateBinding Background}"
                            CornerRadius="{TemplateBinding CornerRadius}">
                                <Grid>
                                    <Border CornerRadius="{TemplateBinding InnerCornerRadius}"/>
                                    <Border x:Name="InnerBorder" CornerRadius="{TemplateBinding InnerCornerRadius}"/>
                                </Grid>
                            </Border>
                            <Border x:Name="CheckedVisual" BorderBrush="{StaticResource ControlOuterBorder_Checked}" BorderThickness="{TemplateBinding BorderThickness}" CornerRadius="{TemplateBinding CornerRadius}" Opacity="0">
                                <Border x:Name="InnerCheckedVisual" BorderBrush="{StaticResource ControlInnerBorder_Checked}" BorderThickness="{TemplateBinding BorderThickness}" Background="{StaticResource ControlBackground_Checked}" CornerRadius="{TemplateBinding InnerCornerRadius}"/>
                            </Border>
                            <Grid>
                                <Grid.ColumnDefinitions>
                                    <ColumnDefinition Width="Auto"/>
                                    <ColumnDefinition Width="*"/>
                                    <ColumnDefinition Width="Auto"/>
                                </Grid.ColumnDefinitions>
                                <Grid.RowDefinitions>
                                    <RowDefinition Height="Auto"/>
                                    <RowDefinition Height="*"/>
                                    <RowDefinition Height="Auto"/>
                                </Grid.RowDefinitions>
                                <ContentPresenter x:Name="Content" ContentTemplate="{TemplateBinding ContentTemplate}" Content="{TemplateBinding Content}" Grid.Column="1" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Margin="{TemplateBinding Padding}" Grid.Row="1" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
                                <Path x:Name="DropDownIndicator" Grid.Column="2" Data="M0,0 L5,0 5,1 4,1 4,2 3,2 3,3 2,3 2,2 1,2 1,1 0,1 0,0 z" Fill="{StaticResource ControlElement_Normal}" HorizontalAlignment="Center" IsHitTestVisible="False" Margin="5,3,5,3" Grid.Row="1" RenderTransformOrigin="0.5,0.5" Visibility="{TemplateBinding DropDownIndicatorVisibility}" VerticalAlignment="Center"/>
                            </Grid>
                            <Popup x:Name="CustomDropDownPopup" Opened="CustomDropDownPopup_Opened" IsOpen="{TemplateBinding IsOpen}" VerticalOffset="{TemplateBinding ActualHeight}">
                                <Grid>
                                    <Border x:Name="DropDownPopupBorder" BorderBrush="Transparent" BorderThickness="0"
                                                Background="Transparent" CornerRadius="0" Height="{TemplateBinding DropDownHeight}"
                                                MaxWidth="{TemplateBinding DropDownMaxWidth}" MaxHeight="{TemplateBinding DropDownMaxHeight}" MinWidth="3" MinHeight="3"
                                                Width="{TemplateBinding DropDownWidth}">
                                        <ContentPresenter x:Name="DropDownPopupContent" ContentTemplate="{TemplateBinding DropDownContentTemplate}"
                                                              Content="{TemplateBinding DropDownContent}"
                                                              DataContext="{Binding DataContext, RelativeSource={RelativeSource TemplatedParent}}"
                                                              HorizontalAlignment="Stretch" VerticalAlignment="Stretch"/>
                                    </Border>
                                </Grid>
                            </Popup>
                            <Popup x:Name="DropDownPopup">
                                <Grid Background="Transparent" Width="1" Height="1">

                                </Grid>
                            </Popup>
                            <Border x:Name="CommonStatesWrapper">
                                <Border x:Name="FocusVisual" BorderBrush="{StaticResource ControlOuterBorder_Focused}" BorderThickness="1" Background="{StaticResource ControlBackground_Focused}" CornerRadius="{TemplateBinding CornerRadius}" Opacity="0" Visibility="Collapsed">
                                    <Border x:Name="FocusInnerVisual" BorderBrush="{StaticResource ControlInnerBorder_Focused}" BorderThickness="1" CornerRadius="{TemplateBinding InnerCornerRadius}"/>
                                </Border>
                            </Border>
                        </Grid>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>

        <SolidColorBrush x:Key="ControlSubItem_OuterBorder_MouseOver" Color="#FFFFC92B"/>
        <Thickness x:Key="ControlSubItem_OuterBorderThickness">1</Thickness>
        <SolidColorBrush x:Key="ControlSubItem_InnerBorder_MouseOver" Color="#FFFFFFFF"/>
        <Thickness x:Key="ControlSubItem_InnerBorderThickness">1</Thickness>
        <LinearGradientBrush x:Key="ControlSubItem_Background_MouseOver" EndPoint="0.5,1" StartPoint="0.5,0">
            <GradientStop Color="#FFFFFBA3" Offset="1"/>
            <GradientStop Color="#FFFFFBDA" Offset="0"/>
        </LinearGradientBrush>
        <CornerRadius x:Key="ControlSubItem_InnerCornerRadius">0</CornerRadius>
        <CornerRadius x:Key="ControlSubItem_OuterCornerRadius">1</CornerRadius>
        <SolidColorBrush x:Key="ControlSubItem_OuterBorder_UnFocus" Color="#FFdbdbdb"/>
        <SolidColorBrush x:Key="ControlSubItem_InnerBorder_UnFocus" Color="Transparent"/>
        <LinearGradientBrush x:Key="ControlSubItem_Background_UnFocus" EndPoint="0,1">
            <GradientStop Color="#FFf8f6f9" Offset="0"/>
            <GradientStop Color="#FFf0f0f0" Offset="1"/>
        </LinearGradientBrush>
        <SolidColorBrush x:Key="ControlSubItem_OuterBorder_Selected" Color="#FFFFC92B"/>
        <SolidColorBrush x:Key="ControlSubItem_InnerBorder_Selected" Color="#FFFFFFFF"/>
        <LinearGradientBrush x:Key="ControlSubItem_Background_Selected" EndPoint="0.5,1" StartPoint="0.5,0">
            <GradientStop Color="#FFFCE79F" Offset="1"/>
            <GradientStop Color="#FFFDD3A8"/>
        </LinearGradientBrush>
        <SolidColorBrush x:Key="TreeView_LineColor" Color="#FFCCCCCC"/>
        <SolidColorBrush x:Key="FocusBrushBlack" Color="#FF000000"/>
        <ControlTemplate x:Key="TreeViewItemDefaultTemplate" TargetType="telerik:RadTreeViewItem">
            <Grid x:Name="RootElement">
                <Grid.RowDefinitions>
                    <RowDefinition Height="Auto"/>
                    <RowDefinition/>
                </Grid.RowDefinitions>

                <Grid x:Name="HeaderRow" Background="Transparent" MinHeight="{TemplateBinding MinHeight}">
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition Width="Auto"/>
                        <ColumnDefinition Width="Auto"/>
                        <ColumnDefinition Width="Auto"/>
                        <ColumnDefinition Width="Auto"/>
                        <ColumnDefinition Width="Auto"/>
                        <ColumnDefinition Width="*"/>
                    </Grid.ColumnDefinitions>
                    <Border BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Grid.ColumnSpan="6" Grid.Column="2" CornerRadius="2"/>
                    <Border x:Name="MouseOverVisual" BorderBrush="{StaticResource ControlSubItem_OuterBorder_MouseOver}" BorderThickness="{StaticResource ControlSubItem_OuterBorderThickness}" Grid.ColumnSpan="6" Grid.Column="2" CornerRadius="{StaticResource ControlSubItem_OuterCornerRadius}" Opacity="0">
                        <Border BorderBrush="{StaticResource ControlSubItem_InnerBorder_MouseOver}" BorderThickness="{StaticResource ControlSubItem_InnerBorderThickness}" Background="{StaticResource ControlSubItem_Background_MouseOver}" CornerRadius="{StaticResource ControlSubItem_InnerCornerRadius}"/>
                    </Border>
                    <Border x:Name="SelectionUnfocusedVisual" BorderBrush="{StaticResource ControlSubItem_OuterBorder_UnFocus}" BorderThickness="{StaticResource ControlSubItem_OuterBorderThickness}" Grid.ColumnSpan="6" Grid.Column="2" CornerRadius="{StaticResource ControlSubItem_OuterCornerRadius}" Visibility="Collapsed">
                        <Border BorderBrush="{StaticResource ControlSubItem_InnerBorder_UnFocus}" BorderThickness="{StaticResource ControlSubItem_InnerBorderThickness}" Background="{StaticResource ControlSubItem_Background_UnFocus}" CornerRadius="{StaticResource ControlSubItem_InnerCornerRadius}"/>
                    </Border>
                    <Border x:Name="SelectionVisual" BorderBrush="{StaticResource ControlSubItem_OuterBorder_Selected}" BorderThickness="{StaticResource ControlSubItem_OuterBorderThickness}" Grid.ColumnSpan="6" Grid.Column="2" CornerRadius="{StaticResource ControlSubItem_OuterCornerRadius}" Visibility="Collapsed">
                        <Border BorderBrush="{StaticResource ControlSubItem_InnerBorder_Selected}" BorderThickness="{StaticResource ControlSubItem_InnerBorderThickness}" Background="{StaticResource ControlSubItem_Background_Selected}" CornerRadius="{StaticResource ControlSubItem_InnerCornerRadius}"/>
                    </Border>
                    <StackPanel x:Name="IndentContainer" Orientation="Horizontal">
                        <Rectangle x:Name="IndentFirstVerticalLine" Stroke="{StaticResource TreeView_LineColor}" Visibility="Collapsed" VerticalAlignment="Top" Width="1">
                            <Rectangle.Clip>
                                <RectangleGeometry Rect="0,0,1,10000"/>
                            </Rectangle.Clip>
                        </Rectangle>
                    </StackPanel>
                    <Grid x:Name="ListRootContainer" Grid.Column="1" HorizontalAlignment="Center" MinWidth="20">
                        <Rectangle x:Name="HorizontalLine" HorizontalAlignment="Right" Height="1" Stroke="{StaticResource TreeView_LineColor}" VerticalAlignment="Center">
                            <Rectangle.Clip>
                                <RectangleGeometry Rect="0,0,10000,1"/>
                            </Rectangle.Clip>
                        </Rectangle>
                        <Rectangle x:Name="VerticalLine" HorizontalAlignment="Center" Stroke="{StaticResource TreeView_LineColor}" VerticalAlignment="Top" Width="1">
                            <Rectangle.Clip>
                                <RectangleGeometry Rect="0,0,1,10000"/>
                            </Rectangle.Clip>
                        </Rectangle>
                        <ToggleButton x:Name="Expander" Background="{TemplateBinding Background}" IsTabStop="False"/>
                        <Grid x:Name="LoadingVisual" HorizontalAlignment="Center" RenderTransformOrigin="0.5,0.5" Visibility="Collapsed" VerticalAlignment="Center">
                            <Grid.RenderTransform>
                                <TransformGroup>
                                    <RotateTransform x:Name="LoadingVisualAngleTransform" Angle="0" CenterY="0.5" CenterX="0.5"/>
                                </TransformGroup>
                            </Grid.RenderTransform>
                            <Path Data="M1,0 A1,1,90,1,1,0,-1" Height="10" StrokeStartLineCap="Round" Stretch="Fill" Stroke="{TemplateBinding Foreground}" StrokeThickness="1" Width="10"/>
                            <Path Data="M0,-1.1 L0.1,-1 L0,-0.9" Fill="{TemplateBinding Foreground}" HorizontalAlignment="Left" Height="4" Margin="5,-1.5,0,0" Stretch="Fill" StrokeThickness="1" VerticalAlignment="Top" Width="4"/>
                        </Grid>
                    </Grid>
                    <CheckBox x:Name="CheckBoxElement" Grid.Column="2" IsTabStop="False" Margin="5,0,0,0" Visibility="Collapsed" VerticalAlignment="Center"/>
                    <RadioButton x:Name="RadioButtonElement" Grid.Column="2" IsTabStop="False" Margin="5,0,0,0" Visibility="Collapsed" VerticalAlignment="Center"/>
                    <Image x:Name="Image" Grid.Column="3" HorizontalAlignment="Center" MaxWidth="16" MaxHeight="16" Margin="2" VerticalAlignment="Center"/>
                    <Rectangle x:Name="FocusVisual" Grid.ColumnSpan="6" Grid.Column="2" IsHitTestVisible="False" RadiusY="3" RadiusX="3" Stroke="{StaticResource FocusBrushBlack}" StrokeThickness="1" StrokeDashArray="1 2" Visibility="Collapsed"/>
                    <Grid Grid.ColumnSpan="2" Grid.Column="4">
                        <ContentPresenter x:Name="Header" ContentTemplate="{TemplateBinding HeaderTemplate}" Content="{TemplateBinding Header}" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Margin="{TemplateBinding Padding}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
                        <ContentPresenter x:Name="EditHeaderElement" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Margin="{TemplateBinding Padding}" Visibility="Collapsed" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
                    </Grid>
                </Grid>
                <ItemsPresenter x:Name="ItemsHost" Grid.Row="1" Visibility="Collapsed"/>
            </Grid>
        </ControlTemplate>
        <Style x:Key="RadTreeViewItemStyle1" TargetType="telerik:RadTreeViewItem">
            <Setter Property="HorizontalContentAlignment" Value="Left"/>
            <Setter Property="VerticalContentAlignment" Value="Center"/>
            <Setter Property="CheckState" Value="Off"/>
            <Setter Property="BorderThickness" Value="1"/>
            <Setter Property="Padding" Value="1 0 5 0"/>
            <Setter Property="IsDropAllowed" Value="True"/>
            <Setter Property="ItemsOptionListType" Value="Default"/>
            <Setter Property="IsEnabled" Value="True"/>
            <Setter Property="MinHeight" Value="24"/>
            <Setter Property="Template" Value="{StaticResource TreeViewItemDefaultTemplate}"/>
            <Setter Property="ItemsPanel">
                <Setter.Value>
                    <ItemsPanelTemplate>
                        <telerik:TreeViewPanel VerticalAlignment="Bottom"/>
                    </ItemsPanelTemplate>
                </Setter.Value>
            </Setter>
        </Style>
    </telerik:RadDropDownButton.Resources>
    <!--<telerik:RadDropDownButton.Template>
        <StaticResource ResourceKey="RadDropDownButtonControlTemplate2"/>
    </telerik:RadDropDownButton.Template>-->
    <telerik:RadDropDownButton.DropDownContent>
            <telerik:RadTreeView x:Name="PartTreeItems" ItemsSource="{Binding FilteringContext.Rows, ElementName=PartHB}" Foreground="{Binding Foreground, ElementName=PartHB}"
                                 FontSize="{Binding Path=FontSize, ElementName=PartHB}" Loaded="PartTreeItems_Loaded"
                                 FontWeight="{Binding Path=FontWeight, ElementName=PartHB}" ScrollViewer.HorizontalScrollBarVisibility="Auto" ScrollViewer.VerticalScrollBarVisibility="Auto"
                                                                     GotFocus="PartTreeItems_GotFocus"
                                                                     MaxHeight="450"
                                                                     MaxWidth="300"
                                                                     MinHeight="250" LostMouseCapture="PartTreeItems_LostMouseCapture" LostFocus="PartTreeItems_LostFocus"
                                                                     MinWidth="200" ItemContainerStyle="{StaticResource RadTreeViewItemStyle1}"
                                                                     Margin="0" Background="{Binding Background, ElementName=PartHB}" BorderBrush="{Binding BorderBrush, ElementName=PartHB}">
                <telerik:RadTreeView.ItemTemplate>
                    <telerik:HierarchicalDataTemplate ItemsSource="{Binding Child}">
                        <TextBlock Text="{Binding Name}" Foreground="{Binding ElementName=PartHB, Path=Foreground}"/>
                    </telerik:HierarchicalDataTemplate>
                </telerik:RadTreeView.ItemTemplate>
            </telerik:RadTreeView>
    </telerik:RadDropDownButton.DropDownContent>
    <telerik:RadDropDownButton.Style>
        <StaticResource ResourceKey="RadDropDownButtonStyle1"/>
    </telerik:RadDropDownButton.Style>
</telerik:RadDropDownButton>

[Ruslan]

this is my code, i need in autoresize and show scroll by browser window if content too big...=)i donot know how do this...

[Lancelot]

Ruslan,

I looked at your code and I added in two important properties, these properties are the one I was telling you about in my other reply. I've attached a screenshot of what you need to do.  Let me know if this doesnt work. If it does work, please mark this post as "Answer" for other people to find who have the same problem as you.

Good Luck!
Lancelot