Hey,

I am trying to get my appointments to update in a backgroundworker. I have the backgroundworker up and running but when I assign my appointments to the ObservableCollection on the viewmodel  in the RunWorkerCompleted and fire the NofityPropertyChanged I get an error "Must create DependencySource on same Thread as the DependencyObject." I do not get this error when notifying of changes to strings and ints. Do you know of any reasons why the NotifyPropertyChanged would not work. 

 Thanks

Hi there.

 I ran into a problem when changing the template for TreeView control. I modified the ItemContainerStyle as follows:

        <Style x:Key="FileBrowserItemStyle" TargetType="{x:Type telerik:RadTreeViewItem}">
            <Setter Property="FocusVisualStyle">
                <Setter.Value>
                    <Style>
                        <Setter Property="Control.Template">
                            <Setter.Value>
                                <ControlTemplate>
                                    <Rectangle Margin="0" Stroke="Transparent" StrokeThickness="0"/>
                                </ControlTemplate>
                            </Setter.Value>
                        </Setter>
                    </Style>
                </Setter.Value>
            </Setter>
            <Setter Property="HorizontalContentAlignment" Value="Left"/>
            <Setter Property="VerticalContentAlignment" Value="Center"/>
            <Setter Property="BorderThickness" Value="1"/>
            <Setter Property="Padding" Value="1,4,5,4"/>
            <Setter Property="MinHeight" Value="24"/>
            <Setter Property="IsDropAllowed" Value="True"/>
            <Setter Property="IsEnabled" Value="True"/>
            <Setter Property="IsTabStop" Value="False"/>
            <Setter Property="KeyboardNavigation.TabNavigation" Value="Local"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type telerik:RadTreeViewItem}">
                        <Grid x:Name="RootElement" UseLayoutRounding="True">
                            <Grid.RowDefinitions>
                                <RowDefinition Height="Auto"/>
                                <RowDefinition/>
                            </Grid.RowDefinitions>
                            <VisualStateManager.VisualStateGroups>
                                <VisualStateGroup x:Name="EditStates">
                                    <VisualState x:Name="Display"/>
                                    <VisualState x:Name="Edit">
                                        <Storyboard>
                                            <ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetProperty="Visibility" Storyboard.TargetName="EditHeaderElement">
                                                <DiscreteObjectKeyFrame KeyTime="0">
                                                    <DiscreteObjectKeyFrame.Value>
                                                        <Visibility>Visible</Visibility>
                                                    </DiscreteObjectKeyFrame.Value>
                                                </DiscreteObjectKeyFrame>
                                            </ObjectAnimationUsingKeyFrames>
                                            <ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetProperty="Visibility" Storyboard.TargetName="Header">
                                                <DiscreteObjectKeyFrame KeyTime="0">
                                                    <DiscreteObjectKeyFrame.Value>
                                                        <Visibility>Collapsed</Visibility>
                                                    </DiscreteObjectKeyFrame.Value>
                                                </DiscreteObjectKeyFrame>
                                            </ObjectAnimationUsingKeyFrames>
                                        </Storyboard>
                                    </VisualState>
                                </VisualStateGroup>
                                <VisualStateGroup x:Name="CommonStates">
                                    <VisualState x:Name="Normal"/>
                                    <VisualState x:Name="Disabled">
                                        <Storyboard>
                                            <DoubleAnimation Duration="0" To="0.35" Storyboard.TargetProperty="Opacity" Storyboard.TargetName="Header"/>
                                            <DoubleAnimation Duration="0" To="0.35" Storyboard.TargetProperty="Opacity" Storyboard.TargetName="Image"/>
                                        </Storyboard>
                                    </VisualState>
                                    <VisualState x:Name="MouseOver">
                                        <Storyboard>
                                            <DoubleAnimation Duration="0:0:0.1" To="1" Storyboard.TargetProperty="Opacity" Storyboard.TargetName="MouseOverVisual"/>
                                        </Storyboard>
                                    </VisualState>
                                </VisualStateGroup>
                                <VisualStateGroup x:Name="SelectionStates">
                                    <VisualState x:Name="Unselected"/>
                                    <VisualState x:Name="Selected">
                                        <Storyboard>
                                            <ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetProperty="Visibility" Storyboard.TargetName="SelectionVisual">
                                                <DiscreteObjectKeyFrame KeyTime="0">
                                                    <DiscreteObjectKeyFrame.Value>
                                                        <Visibility>Visible</Visibility>
                                                    </DiscreteObjectKeyFrame.Value>
                                                </DiscreteObjectKeyFrame>
                                            </ObjectAnimationUsingKeyFrames>
                                        </Storyboard>
                                    </VisualState>
                                    <VisualState x:Name="SelectedUnfocused">
                                        <Storyboard>
                                            <ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetProperty="Visibility" Storyboard.TargetName="SelectionUnfocusedVisual">
                                                <DiscreteObjectKeyFrame KeyTime="0">
                                                    <DiscreteObjectKeyFrame.Value>
                                                        <Visibility>Visible</Visibility>
                                                    </DiscreteObjectKeyFrame.Value>
                                                </DiscreteObjectKeyFrame>
                                            </ObjectAnimationUsingKeyFrames>
                                        </Storyboard>
                                    </VisualState>
                                </VisualStateGroup>
                                <VisualStateGroup x:Name="LoadingOnDemandStates">
                                    <VisualState x:Name="LoadingOnDemand">
                                        <Storyboard>
                                            <ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetProperty="Visibility" Storyboard.TargetName="LoadingVisual">
                                                <DiscreteObjectKeyFrame KeyTime="0">
                                                    <DiscreteObjectKeyFrame.Value>
                                                        <Visibility>Visible</Visibility>
                                                    </DiscreteObjectKeyFrame.Value>
                                                </DiscreteObjectKeyFrame>
                                            </ObjectAnimationUsingKeyFrames>
                                            <ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetProperty="Visibility" Storyboard.TargetName="Expander">
                                                <DiscreteObjectKeyFrame KeyTime="0">
                                                    <DiscreteObjectKeyFrame.Value>
                                                        <Visibility>Collapsed</Visibility>
                                                    </DiscreteObjectKeyFrame.Value>
                                                </DiscreteObjectKeyFrame>
                                            </ObjectAnimationUsingKeyFrames>
                                            <DoubleAnimation Duration="0:0:1" From="0" RepeatBehavior="Forever" To="359" Storyboard.TargetProperty="Angle" Storyboard.TargetName="LoadingVisualAngleTransform"/>
                                        </Storyboard>
                                    </VisualState>
                                    <VisualState x:Name="LoadingOnDemandReverse"/>
                                </VisualStateGroup>
                                <VisualStateGroup x:Name="FocusStates">
                                    <VisualState x:Name="Focused">
                                        <Storyboard>
                                            <ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetProperty="Visibility" Storyboard.TargetName="FocusVisual">
                                                <DiscreteObjectKeyFrame KeyTime="0">
                                                    <DiscreteObjectKeyFrame.Value>
                                                        <Visibility>Visible</Visibility>
                                                    </DiscreteObjectKeyFrame.Value>
                                                </DiscreteObjectKeyFrame>
                                            </ObjectAnimationUsingKeyFrames>
                                        </Storyboard>
                                    </VisualState>
                                    <VisualState x:Name="Unfocused"/>
                                </VisualStateGroup>
                                <VisualStateGroup x:Name="ExpandStates">
                                    <VisualState x:Name="Expanded">
                                        <Storyboard>
                                            <ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetProperty="Visibility" Storyboard.TargetName="ItemsHost">
                                                <DiscreteObjectKeyFrame KeyTime="0">
                                                    <DiscreteObjectKeyFrame.Value>
                                                        <Visibility>Visible</Visibility>
                                                    </DiscreteObjectKeyFrame.Value>
                                                </DiscreteObjectKeyFrame>
                                            </ObjectAnimationUsingKeyFrames>
                                        </Storyboard>
                                    </VisualState>
                                    <VisualState x:Name="Collapsed"/>
                                </VisualStateGroup>
                            </VisualStateManager.VisualStateGroups>
                            <Grid x:Name="HeaderRow" Background="Transparent" MinHeight="{TemplateBinding MinHeight}" SnapsToDevicePixels="True">
                                <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="#FF838383" BorderThickness="1" Grid.ColumnSpan="6" Grid.Column="2" CornerRadius="1" Opacity="0">
                                    <Border.Background>
                                        <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                                            <GradientStop Color="#FFDADADA" Offset="1"/>
                                            <GradientStop Color="#FFB6B6B6" Offset="0"/>
                                        </LinearGradientBrush>
                                    </Border.Background>
                                    <Border BorderBrush="White" BorderThickness="1" Background="{x:Null}" CornerRadius="0"/>
                                </Border>
                                <Border x:Name="SelectionUnfocusedVisual" BorderBrush="#FFDBDBDB" BorderThickness="1" Grid.ColumnSpan="6" Grid.Column="2" CornerRadius="1" Visibility="Collapsed">
                                    <Border.Background>
                                        <LinearGradientBrush EndPoint="0,1">
                                            <GradientStop Color="#FFF8F6F9" Offset="0"/>
                                            <GradientStop Color="#FFCBCBCB" Offset="1"/>
                                        </LinearGradientBrush>
                                    </Border.Background>
                                    <Border BorderBrush="Transparent" BorderThickness="1" Background="{x:Null}" CornerRadius="0"/>
                                </Border>
                                <Border x:Name="SelectionVisual" BorderBrush="#FF494949" BorderThickness="1" Grid.ColumnSpan="6" Grid.Column="2" CornerRadius="1" Visibility="Collapsed">
                                    <Border.Background>
                                        <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                                            <GradientStop Color="#FFBBBBBB" Offset="1"/>
                                            <GradientStop Color="#FF959595"/>
                                        </LinearGradientBrush>
                                    </Border.Background>
                                    <Border BorderBrush="White" BorderThickness="1" Background="{x:Null}" CornerRadius="0"/>
                                </Border>
                                <StackPanel x:Name="IndentContainer" Orientation="Horizontal">
                                    <Rectangle x:Name="IndentFirstVerticalLine" Stroke="#FFCCCCCC" Visibility="Collapsed" VerticalAlignment="Top" Width="1"/>
                                </StackPanel>
                                <Grid x:Name="ListRootContainer" Grid.Column="1" HorizontalAlignment="Center" MinWidth="21">
                                    <Rectangle x:Name="HorizontalLine" HorizontalAlignment="Right" Height="1" Stroke="#FFCCCCCC" VerticalAlignment="Center"/>
                                    <Rectangle x:Name="VerticalLine" HorizontalAlignment="Center" Stroke="#FFCCCCCC" VerticalAlignment="Top" Width="1"/>
                                    <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 Angle="0" CenterY="0.5" CenterX="0.5"/>
                                            </TransformGroup>
                                        </Grid.RenderTransform>
                                        <Path Data="M1,0A1,1,90,1,1,0,-1" Height="10" StrokeStartLineCap="Round" Stretch="Fill" Stroke="{TemplateBinding Foreground}" StrokeThickness="1" Width="10"/>
                                        <Path Data="M0,-1.1L0.1,-1 0,-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>
                                <Image x:Name="Image" Grid.Column="3" HorizontalAlignment="Center" MaxWidth="20" MaxHeight="20" Margin="2" VerticalAlignment="Center"/>
                                <Rectangle x:Name="FocusVisual" Grid.ColumnSpan="6" Grid.Column="2" IsHitTestVisible="False" RadiusY="3" RadiusX="3" Stroke="Black" StrokeThickness="1" StrokeDashArray="1 2" Visibility="Collapsed"/>
                                <Grid x:Name="HeaderContentPanel" Background="Transparent" Grid.ColumnSpan="2" Grid.Column="4">
                                    <ContentControl x:Name="Header" ContentTemplate="{TemplateBinding HeaderTemplate}" Content="{TemplateBinding Header}" Foreground="{Binding Foreground, Mode=OneWay, RelativeSource={RelativeSource TemplatedParent}}" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" IsTabStop="False" Margin="{TemplateBinding Padding}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
                                    <ContentPresenter x:Name="EditHeaderElement" ContentTemplate="{TemplateBinding HeaderEditTemplate}" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Margin="{TemplateBinding Padding}" Visibility="Collapsed" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
                                </Grid>
                                <CheckBox x:Name="CheckBoxElement" Grid.Column="2" IsTabStop="False" Margin="5,0,0,0" Visibility="Collapsed" VerticalAlignment="Center">
                                    <telerik:StyleManager.Theme>
                                        <telerik:Office_BlackTheme/>
                                    </telerik:StyleManager.Theme>
                                </CheckBox>
                                <RadioButton x:Name="RadioButtonElement" Grid.Column="2" IsTabStop="False" Margin="5,0,0,0" Visibility="Collapsed" VerticalAlignment="Center">
                                    <telerik:StyleManager.Theme>
                                        <telerik:Office_BlackTheme/>
                                    </telerik:StyleManager.Theme>
                                </RadioButton>
                            </Grid>
                            <ItemsPresenter x:Name="ItemsHost" Grid.Row="1" Visibility="Collapsed"/>
                        </Grid>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
            <Setter Property="ItemsPanel">
                <Setter.Value>
                    <ItemsPanelTemplate>
                        <telerik:TreeViewPanel IsItemsHost="True" IsVisualCacheEnabled="False" VerticalAlignment="Bottom"/>
                    </ItemsPanelTemplate>
                </Setter.Value>
            </Setter>
        </Style>

and assigned the template to the control:

        <telerik:RadTreeView x:Name="FileList" FontSize="18" FontFamily="Courier New" HorizontalAlignment="Left" Height="250" VerticalAlignment="Top" Width="150" Background="#FFEEEEEE" Style="{DynamicResource FileBrowserStyl}" ItemContainerStyle="{DynamicResource FileBrowserItemStyle}"/>

All I really did was changing the color of the selected item from orange to grey  but it only seems to change the color for the first level of hierarchy (image attached). I thought the ItemContainerStyle applies for all levels. Am I missing something?

 Would really appreciate your help.

Thank you

I am using MVVM with the Telerik RadComboBox.

On selection of an item in my list, I open a new window. The new window gets focus, and then the focus is stolen back by the RadComboBox, and the new window dissapears behind.

When I do the exact same thing and replace the RadCombo with standard wpf Combo, it works perfectly and does not take focus after selection.

I have tried numerous approaches to have the new window retain focus without success. I have tried setting the new window initially to TopMost when initialised, but still the RadCombo steals the focus after all this has run.

My new window is opened in code triggered from the setter of the property bound to the SelectedItem. So basically it appears that the selected Item setter runs, then after that completes, then it forces focus on itself.

Is there any way to avoid this?

I would use the standard combo, but I have a custom watermark setup and also a custom Clear selection mechanism in the Telerik control I would like to retain.

thanks

Duncan

Hello,

I have an application where I have a RadDataFilter, RadGridView, and RadDataPager all connected to a QueryableCollectionView, fed by an IQueryable query provided by Entity Framework 6.1. See below for sample code

I've read in some other forum posts and articles, DataLoadMode="Asynchronous" is not recommended, and I see why. I'm getting a couple of interesting bugs.

1) We often need to change the query that's bound to the grid (but still bound to the same entity type). As I don't see a way to change it for the existing, bound QueryableCollectionView, I just create and assign a new QueryableCollectionView to the QCV property in my view model (this raises a PropertyChanged event). When I try this, the busy indicator stays on after loading and displaying the data, behind the spinner. Going to another page, sorting, or filtering will remove the spinner.

2) When paging and filtering, the first half of the items in the grid are hidden, while the other half stays visible, behind the spinner. This isn't really a functional issue, but it looks a bit weird, and distracting.

As I mentioned before, I know that your suggestion is to not set DataLoadMode="Asynchronous", but then in that case, is there no way that I can asynchronously load data using an IQueryable from Entity Framework, with the Busy Indicator, that works properly? I can't block the UI thread in our application while loading data. Some of our queries are complex and can take 5+ seconds to respond. I don't mind the time it takes, but I do mind that the user can't interact with the UI during that time.

Is there another class I can use? Some provider classes I can extend? This was very simple to do in Silverlight with WCF and the QueryableDomainServiceCollectionView. I'm surprised how this isn't as simple for WPF and Entity Framework.

Hi,

Is it possible to change the summery arrows color?

I tried with this code ... but only the line color changed

Thank you

I've added a new property to my SqlAppointment class called 'Service Code'.  When this property changes I'd like to filter down one of my resources lists to only those 'Providers' that can service that 'Service Code'. 

How can I access the ResourceType collection from within the SqlAppointment class? 

Is there a way to override the AppointmentDialogViewModel so that I can access the properties there?

I have a grid which displays a text field which can be large. This is set to wrap and does visualize correctly which means that the row height increases to allow the cell text to wrap. However when the cell is edited then the height returns to default, which is essentially one row of text high.

I would like the cell to be able to be edited in wrap mode as well. Is this possible?

Hi, I'm trying to create a button inside a column header and I'm facing binding problems. My code looks like this:

But the command is never invoked due to this error:

System.Windows.Data Error: 4 : Cannot find source for binding with reference 'RelativeSource FindAncestor, AncestorType='Telerik.Windows.Controls.RadGridView', AncestorLevel='1''. BindingExpression:Path=DataContext.CopyCommand; DataItem=null; target element is 'Button' (Name=''); target property is 'Command' (type 'ICommand') 

I've tried with other Ancestor levels with no luck.

I tried to workaround this problem setting the command in the Loaded event of the button and it works, but I have a similar problem trying to set a Binding with a converter for Visibility in code behind:

I've seen in another threads that you recommend to create a static resource with the view model, but we are working using our client's framework and we are not allowed to do that.

How can I create a proper binding?

Thanks,

Vicenc

We use a RibbonWindow as our main window for the application. Everything works fine except when maximized: the bottom part of the window is hidden under the taskbar. (Version: 2015.1.225.45) Here is the definition of the window:

Regards
Neils