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How to access controls in header style

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GridView
This is a migrated thread and some comments may be shown as answers.
Peter Meinl
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Peter Meinl asked on 09 Apr 2010, 12:39 PM
I have defined ComboBoxes for filtering in the grid header style (see XAML below).
How can I access the ComboBoxes from code?

a)
I do not understand how to loop through the grids columns an access the ComboBox in each columns header.

b)
I the ComboBoxes SelectionChanged event I do not understand how to determine the grid column of the ComboBox raising the event.

       <Style x:Key="GridViewHeaderCellFilterStyle" TargetType="{x:Type telerik:GridViewHeaderCell}">  
                <Setter Property="Template">  
                    <Setter.Value> 
                        <ControlTemplate TargetType="{x:Type telerik:GridViewHeaderCell}">  
                            <Grid x:Name="PART_HeaderCellGrid">  
                                  
                                <Grid.ColumnDefinitions> 
                                    <ColumnDefinition Width="*"/>  
                                    <ColumnDefinition Width="Auto"/>  
                                </Grid.ColumnDefinitions> 
 
                     <!-- Modification Start--> 
                            <Grid.RowDefinitions> 
                                <RowDefinition Height="Auto" /> 
                                <RowDefinition Height="*" /> 
                            </Grid.RowDefinitions> 
                            <Grid Grid.Row="1" Grid.ColumnSpan="2" Height="20">  
                                    <Grid.ColumnDefinitions> 
                                        <ColumnDefinition Width="Auto"/>  
                                        <ColumnDefinition Width="*"/>  
                                    </Grid.ColumnDefinitions> 
                                <telerik:RadComboBox Grid.Column="0" x:Name="cboOperator" SelectionChanged="cboOperator_SelectionChanged"  FontWeight="Normal">  
                                        <telerik:RadComboBoxItem Content="=" IsSelected="True"></telerik:RadComboBoxItem> 
                                        <telerik:RadComboBoxItem Content="&lt;"></telerik:RadComboBoxItem> 
                                        <telerik:RadComboBoxItem Content="&lt;="></telerik:RadComboBoxItem> 
                                        <telerik:RadComboBoxItem Content="&gt;"></telerik:RadComboBoxItem> 
                                        <telerik:RadComboBoxItem Content="&gt;="></telerik:RadComboBoxItem> 
                                        <telerik:RadComboBoxItem Content="in"></telerik:RadComboBoxItem> 
                                        <telerik:RadComboBoxItem Content="like"></telerik:RadComboBoxItem> 
                                    </telerik:RadComboBox> 
                                <telerik:RadComboBox Grid.Column="1" x:Name="cboValue"  HorizontalAlignment="Stretch" IsEditable="True" IsReadOnly="False" FontWeight="Normal"></telerik:RadComboBox> 
                                 
                            </Grid> 
 
                      <!-- Modification End --> 
 
 
                            <Border x:Name="GridViewHeaderCell" Grid.ColumnSpan="2" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}">  
                                    <Border Background="{TemplateBinding Background}" BorderBrush="#FF4B4B4B" BorderThickness="1"/>  
                                </Border> 
                                <Border x:Name="GridViewHeaderCell_Over" Opacity="0" Grid.ColumnSpan="2" BorderBrush="#FFFFC92B" BorderThickness="{TemplateBinding BorderThickness}">  
                                    <Border BorderBrush="White" BorderThickness="1">  
                                        <Border.Background> 
                                            <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">  
                                                <GradientStop Color="#FFFFFBA3" Offset="1"/>  
                                                <GradientStop Color="#FFFFFBDA" Offset="0"/>  
                                                <GradientStop Color="#FFFFD25A" Offset="0.43"/>  
                                                <GradientStop Color="#FFFEEBAE" Offset="0.42"/>  
                                            </LinearGradientBrush> 
                                        </Border.Background> 
                                    </Border> 
                                </Border> 
                                <Border x:Name="GridViewHeaderCell_Selected" Opacity="0" Grid.ColumnSpan="2" BorderThickness="{TemplateBinding BorderThickness}">  
                                    <Border.BorderBrush> 
                                        <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">  
                                            <GradientStop Color="#FF616161" Offset="0"/>  
                                            <GradientStop Color="#FF989898" Offset="1"/>  
                                        </LinearGradientBrush> 
                                    </Border.BorderBrush> 
                                    <Border BorderThickness="1">  
                                        <Border.Background> 
                                            <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">  
                                                <GradientStop Color="#FFFFD74E" Offset="0.996"/>  
                                                <GradientStop Color="#FFFFDCAB" Offset="0.17"/>  
                                                <GradientStop Color="#FFFFB062" Offset="0.57"/>  
                                                <GradientStop Color="#FFFFD18F" Offset="0.56"/>  
                                                <GradientStop Color="#FFFFBA74"/>  
                                            </LinearGradientBrush> 
                                        </Border.Background> 
                                        <Border.BorderBrush> 
                                            <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">  
                                                <GradientStop Color="#FFB69A78"/>  
                                                <GradientStop Color="#FFFFE17A" Offset="0.126"/>  
                                            </LinearGradientBrush> 
                                        </Border.BorderBrush> 
                                    </Border> 
                                </Border> 
                                <ContentControl x:Name="ContentPresenter" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Margin="{TemplateBinding Padding}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" Content="{TemplateBinding Content}" ContentTemplate="{TemplateBinding ContentTemplate}" Foreground="{TemplateBinding Foreground}" Grid.Column="0"/>  
                                <Path x:Name="PART_SortIndicator" Fill="Black" Stretch="Fill" HorizontalAlignment="Center" Margin="0,3,0,0" VerticalAlignment="Top" Width="5" Height="3" Opacity="0" RenderTransformOrigin="0.5,0.5" Grid.ColumnSpan="2" Data="M0,0L1,0 2,0 3,0 4,0 5,0 5,1 4,1 4,2 3,2 3,3 2,3 2,2 1,2 1,1 0,1 0,0z">  
                                    <Path.RenderTransform> 
                                        <TransformGroup> 
                                            <ScaleTransform ScaleX="1" ScaleY="-1"/>  
                                            <SkewTransform AngleX="0" AngleY="0"/>  
                                            <RotateTransform Angle="0"/>  
                                            <TranslateTransform X="0" Y="0"/>  
                                        </TransformGroup> 
                                    </Path.RenderTransform> 
                                </Path> 
                                <!--<telerik:FilteringDropDown x:Name="PART_DistinctFilterControl" Margin="0,0,8,0" IsTabStop="False" Visibility="{TemplateBinding FilteringUIVisibility}" Grid.Column="1">  
                                    <telerik:StyleManager.Theme> 
                                        <telerik:Office_BlackTheme/> 
                                    </telerik:StyleManager.Theme> 
                                </telerik:FilteringDropDown>--> 
                                <Thumb x:Name="PART_LeftHeaderGripper" HorizontalAlignment="Left" Grid.ColumnSpan="2">  
                                    <Thumb.Style> 
                                        <Style TargetType="{x:Type Thumb}">  
                                            <Setter Property="Width" Value="8"/>  
                                            <Setter Property="Background" Value="Transparent"/>  
                                            <Setter Property="BorderBrush" Value="Transparent"/>  
                                            <Setter Property="BorderThickness" Value="0"/>  
                                            <Setter Property="HorizontalContentAlignment" Value="Stretch"/>  
                                            <Setter Property="VerticalContentAlignment" Value="Stretch"/>  
                                            <Setter Property="Padding" Value="0"/>  
                                            <Setter Property="Cursor" Value="SizeWE"/>  
                                            <Setter Property="Template">  
                                                <Setter.Value> 
                                                    <ControlTemplate TargetType="{x:Type Thumb}">  
                                                        <Border HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Padding="{TemplateBinding Padding}"/>  
                                                    </ControlTemplate> 
                                                </Setter.Value> 
                                            </Setter> 
                                        </Style> 
                                    </Thumb.Style> 
                                </Thumb> 
                                <Thumb x:Name="PART_RightHeaderGripper" HorizontalAlignment="Right" Grid.ColumnSpan="2">  
                                    <Thumb.Style> 
                                        <Style TargetType="{x:Type Thumb}">  
                                            <Setter Property="Width" Value="8"/>  
                                            <Setter Property="Background" Value="Transparent"/>  
                                            <Setter Property="BorderBrush" Value="Transparent"/>  
                                            <Setter Property="BorderThickness" Value="0"/>  
                                            <Setter Property="HorizontalContentAlignment" Value="Stretch"/>  
                                            <Setter Property="VerticalContentAlignment" Value="Stretch"/>  
                                            <Setter Property="Padding" Value="0"/>  
                                            <Setter Property="Cursor" Value="SizeWE"/>  
                                            <Setter Property="Template">  
                                                <Setter.Value> 
                                                    <ControlTemplate TargetType="{x:Type Thumb}">  
                                                        <Border HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Padding="{TemplateBinding Padding}"/>  
                                                    </ControlTemplate> 
                                                </Setter.Value> 
                                            </Setter> 
                                        </Style> 
                                    </Thumb.Style> 
                                </Thumb> 
                            </Grid> 
                            <ControlTemplate.Triggers> 
                                <MultiTrigger> 
                                    <MultiTrigger.EnterActions> 
                                        <BeginStoryboard> 
                                            <Storyboard> 
                                                <DoubleAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetName="GridViewHeaderCell_Over" Storyboard.TargetProperty="Opacity">  
                                                    <SplineDoubleKeyFrame KeyTime="00:00:00.2000000" Value="1"/>  
                                                </DoubleAnimationUsingKeyFrames> 
                                            </Storyboard> 
                                        </BeginStoryboard> 
                                    </MultiTrigger.EnterActions> 
                                    <MultiTrigger.ExitActions> 
                                        <BeginStoryboard> 
                                            <Storyboard> 
                                                <DoubleAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetName="GridViewHeaderCell_Over" Storyboard.TargetProperty="Opacity">  
                                                    <SplineDoubleKeyFrame KeyTime="00:00:00.2000000" Value="0"/>  
                                                </DoubleAnimationUsingKeyFrames> 
                                            </Storyboard> 
                                        </BeginStoryboard> 
                                    </MultiTrigger.ExitActions> 
                                    <MultiTrigger.Conditions> 
                                        <Condition Property="IsMouseOver" Value="True"/>  
                                        <Condition Property="SortingState" Value="None"/>  
                                    </MultiTrigger.Conditions> 
                                    <Setter Property="Foreground" Value="Black"/>  
                                </MultiTrigger> 
                                <Trigger Property="SortingState" Value="Ascending">  
                                    <Setter Property="Foreground" Value="Black"/>  
                                    <Setter Property="Opacity" TargetName="PART_SortIndicator" Value="1"/>  
                                    <Setter Property="LayoutTransform" TargetName="PART_SortIndicator">  
                                        <Setter.Value> 
                                            <ScaleTransform ScaleX="1" ScaleY="1"/>  
                                        </Setter.Value> 
                                    </Setter> 
                                    <Setter Property="Opacity" TargetName="GridViewHeaderCell_Selected" Value="1"/>  
                                </Trigger> 
                                <Trigger Property="SortingState" Value="Descending">  
                                    <Setter Property="Foreground" Value="Black"/>  
                                    <Setter Property="Opacity" TargetName="PART_SortIndicator" Value="1"/>  
                                    <Setter Property="LayoutTransform" TargetName="PART_SortIndicator">  
                                        <Setter.Value> 
                                            <ScaleTransform ScaleX="1" ScaleY="-1"/>  
                                        </Setter.Value> 
                                    </Setter> 
                                    <Setter Property="Opacity" TargetName="GridViewHeaderCell_Selected" Value="1"/>  
                                </Trigger> 
                                <Trigger Property="SortingState" Value="None">  
                                    <Setter Property="Opacity" TargetName="PART_SortIndicator" Value="0"/>  
                                </Trigger> 
                            </ControlTemplate.Triggers> 
                        </ControlTemplate> 
                    </Setter.Value> 
                </Setter> 
                <Setter Property="Background">  
                    <Setter.Value> 
                        <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">  
                            <GradientStop Color="#FF5B5B5B" Offset="1"/>  
                            <GradientStop Color="#FF868686"/>  
                            <GradientStop Color="#FF4F4F4F" Offset="0.42"/>  
                            <GradientStop Color="#FF0E0E0E" Offset="0.43"/>  
                        </LinearGradientBrush> 
                    </Setter.Value> 
                </Setter> 
                <Setter Property="BorderBrush" Value="#FF848484"/>  
                <Setter Property="BorderThickness" Value="0,0,1,1"/>  
                <Setter Property="VerticalContentAlignment" Value="Center"/>  
                <Setter Property="HorizontalContentAlignment" Value="Stretch"/>  
                <Setter Property="Padding" Value="5,0,3,0"/>  
                <Setter Property="Foreground" Value="White"/>  
                <Setter Property="DropMarkPen">  
                    <Setter.Value> 
                        <Pen Brush="White" Thickness="2"/>  
                    </Setter.Value> 
                </Setter> 
                <Setter Property="SnapsToDevicePixels" Value="True"/>  
            </Style> 

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Vlad
Telerik team
answered on 12 Apr 2010, 11:01 AM
Hello,

You can use both ParentOfType<> and ChildrenOfType<> to access controls in the cell visual tree. For example ParentOfType<GridViewHeaderCell> in SelectionChanged will get the parent header cell of the combo.

Greetings,
Vlad
the Telerik team

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GridView
Asked by
Peter Meinl
Top achievements
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Answers by
Vlad
Telerik team
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