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POChanging background of custom WPF ComboBox
 

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    <p>I've got a custom ComboBox which should react to the value of some dependency properties. (e.g. validation). Now, I just can't find out how to change the background of the combobox control in the triggers of the controltemplate... I can change the dropdown menu, but haven't yet found out how to change the background of the whole control. The dependency properties are set correctly, here's the XAML:</p> <pre class="lang-xml prettyprint-override"><code> &lt;ControlTemplate x:Key="ComboBoxToggleButton" TargetType="ToggleButton"&gt; &lt;Grid&gt; &lt;Grid.ColumnDefinitions&gt; &lt;ColumnDefinition /&gt; &lt;ColumnDefinition Width="20" /&gt; &lt;/Grid.ColumnDefinitions&gt; &lt;Border x:Name="Border" Grid.ColumnSpan="2" CornerRadius="2" Background="{StaticResource NormalBrush}" BorderBrush="{StaticResource NormalBorderBrush}" BorderThickness="1" /&gt; &lt;Border Grid.Column="0" CornerRadius="2,0,0,2" Margin="1" Background="{StaticResource WindowBackgroundBrush}" BorderBrush="{StaticResource NormalBorderBrush}" BorderThickness="0,0,1,0" /&gt; &lt;Path x:Name="Arrow" Grid.Column="1" Fill="{StaticResource GlyphBrush}" HorizontalAlignment="Center" VerticalAlignment="Center" Data="M 0 0 L 4 4 L 8 0 Z"/&gt; &lt;/Grid&gt; &lt;ControlTemplate.Triggers&gt; &lt;Trigger Property="ToggleButton.IsMouseOver" Value="true"&gt; &lt;Setter TargetName="Border" Property="Background" Value="{StaticResource DarkBrush}" /&gt; &lt;/Trigger&gt; &lt;Trigger Property="ToggleButton.IsChecked" Value="true"&gt; &lt;Setter TargetName="Border" Property="Background" Value="{StaticResource PressedBrush}" /&gt; &lt;/Trigger&gt; &lt;Trigger Property="IsEnabled" Value="False"&gt; &lt;Setter TargetName="Border" Property="Background" Value="{StaticResource DisabledBackgroundBrush}" /&gt; &lt;Setter TargetName="Border" Property="BorderBrush" Value="{StaticResource DisabledBorderBrush}" /&gt; &lt;Setter Property="Foreground" Value="{StaticResource DisabledForegroundBrush}"/&gt; &lt;Setter TargetName="Arrow" Property="Fill" Value="{StaticResource DisabledForegroundBrush}" /&gt; &lt;/Trigger&gt; &lt;/ControlTemplate.Triggers&gt; &lt;/ControlTemplate&gt; &lt;ControlTemplate x:Key="ComboBoxTextBox" TargetType="TextBox"&gt; &lt;Border x:Name="PART_ContentHost" Focusable="False" Background="{TemplateBinding Background}" /&gt; &lt;/ControlTemplate&gt; &lt;Style x:Key="{x:Type local:ErgoDentComboBox}" TargetType="ComboBox" BasedOn="ComboBox"&gt; &lt;Setter Property="SnapsToDevicePixels" Value="true"/&gt; &lt;!--&lt;Setter Property="OverridesDefaultStyle" Value="true"/&gt;--&gt; &lt;Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Auto"/&gt; &lt;Setter Property="ScrollViewer.VerticalScrollBarVisibility" Value="Auto"/&gt; &lt;Setter Property="ScrollViewer.CanContentScroll" Value="true"/&gt; &lt;Setter Property="MinWidth" Value="120"/&gt; &lt;Setter Property="MinHeight" Value="20"/&gt; &lt;Setter Property="Template"&gt; &lt;Setter.Value&gt; &lt;ControlTemplate TargetType="{x:Type local:ErgoDentComboBox}"&gt; &lt;Grid&gt; &lt;ToggleButton Name="ToggleButton" Template="{StaticResource ComboBoxToggleButton}" Grid.Column="2" Focusable="false" IsChecked="{Binding Path=IsDropDownOpen,Mode=TwoWay,RelativeSource={RelativeSource TemplatedParent}}" ClickMode="Press"&gt; &lt;/ToggleButton&gt; &lt;ContentPresenter Name="ContentSite" IsHitTestVisible="False" Content="{TemplateBinding SelectionBoxItem}" ContentTemplate="{TemplateBinding SelectionBoxItemTemplate}" ContentTemplateSelector="{TemplateBinding ItemTemplateSelector}" Margin="3,3,23,3" VerticalAlignment="Center" HorizontalAlignment="Left" /&gt; &lt;TextBox x:Name="PART_EditableTextBox" Style="{x:Null}" Template="{StaticResource ComboBoxTextBox}" HorizontalAlignment="Left" VerticalAlignment="Center" Margin="3,3,23,3" Focusable="True" Background="Transparent" Visibility="Hidden" IsReadOnly="{TemplateBinding IsReadOnly}"/&gt; &lt;Popup Name="Popup" Placement="Bottom" IsOpen="{TemplateBinding IsDropDownOpen}" AllowsTransparency="True" Focusable="False" PopupAnimation="Slide"&gt; &lt;Grid Name="DropDown" SnapsToDevicePixels="True" MinWidth="{TemplateBinding ActualWidth}" MaxHeight="{TemplateBinding MaxDropDownHeight}"&gt; &lt;Border x:Name="DropDownBorder" Background="{StaticResource WindowBackgroundBrush}" BorderThickness="1" BorderBrush="{StaticResource SolidBorderBrush}"/&gt; &lt;ScrollViewer Margin="4,6,4,6" SnapsToDevicePixels="True"&gt; &lt;StackPanel IsItemsHost="True" KeyboardNavigation.DirectionalNavigation="Contained" /&gt; &lt;/ScrollViewer&gt; &lt;/Grid&gt; &lt;/Popup&gt; &lt;/Grid&gt; &lt;ControlTemplate.Triggers&gt; &lt;Trigger Property="HasItems" Value="false"&gt; &lt;Setter TargetName="DropDownBorder" Property="MinHeight" Value="95"/&gt; &lt;/Trigger&gt; &lt;Trigger Property="IsEnabled" Value="false"&gt; &lt;Setter Property="Foreground" Value="{StaticResource DisabledForegroundBrush}"/&gt; &lt;/Trigger&gt; &lt;Trigger Property="IsGrouping" Value="true"&gt; &lt;Setter Property="ScrollViewer.CanContentScroll" Value="false"/&gt; &lt;/Trigger&gt; &lt;Trigger SourceName="Popup" Property="Popup.AllowsTransparency" Value="true"&gt; &lt;Setter TargetName="DropDownBorder" Property="CornerRadius" Value="4"/&gt; &lt;Setter TargetName="DropDownBorder" Property="Margin" Value="0,2,0,0"/&gt; &lt;/Trigger&gt; &lt;Trigger Property="IsEditable" Value="true"&gt; &lt;Setter Property="IsTabStop" Value="false"/&gt; &lt;Setter TargetName="PART_EditableTextBox" Property="Visibility" Value="Visible"/&gt; &lt;Setter TargetName="ContentSite" Property="Visibility" Value="Hidden"/&gt; &lt;/Trigger&gt; &lt;!-- THIS ISN'T WORKING --&gt; &lt;Trigger Property="IsValidationError" Value="False"&gt; &lt;Setter Property="BorderBrush" Value="DarkGreen" /&gt; &lt;Setter Property="Background" Value="Green" /&gt; &lt;/Trigger&gt; &lt;/ControlTemplate.Triggers&gt; &lt;/ControlTemplate&gt; &lt;/Setter.Value&gt; &lt;/Setter&gt; &lt;Style.Triggers&gt; &lt;/Style.Triggers&gt; &lt;/Style&gt; </code></pre> <p>In the code of the control I can easily set the background, how would I do this in the triggers?</p> <p>Thanks</p> <p>Danny</p>
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