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POHighlight TreeView item being dragged over
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  1. POHighlight TreeView item being dragged over
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    copied!<p>In my application, I have a TreeView that allows drag/drop. I have all the functionality working fine, however I am having difficulty highlighting a TreeViewItem when it is dragged over. Here is my style for my treeview item. The IsMouseOver trigger does not work while dragging, because dragging seems to block other mouse events. Can anyone help me trigger the same border changes on my treeview item while dragging?</p> <pre><code>&lt;Style x:Key="TreeViewItemStyle" TargetType="{x:Type TreeViewItem}"&gt; &lt;Setter Property="Template"&gt; &lt;Setter.Value&gt; &lt;ControlTemplate TargetType="{x:Type TreeViewItem}"&gt; &lt;Grid&gt; &lt;Grid.ColumnDefinitions&gt; &lt;ColumnDefinition MinWidth="19" Width="Auto"/&gt; &lt;ColumnDefinition Width="Auto"/&gt; &lt;ColumnDefinition Width="*"/&gt; &lt;/Grid.ColumnDefinitions&gt; &lt;Grid.RowDefinitions&gt; &lt;RowDefinition Height="Auto"/&gt; &lt;RowDefinition/&gt; &lt;/Grid.RowDefinitions&gt; &lt;ToggleButton x:Name="PART_Expander" Style="{StaticResource ExpandCollapseToggleStyle}" IsChecked="{Binding Path=IsExpanded, RelativeSource={RelativeSource TemplatedParent}}" ClickMode="Press" /&gt; &lt;Border x:Name="OuterBorder" Grid.Column="1" SnapsToDevicePixels="True" BorderThickness="1" CornerRadius="3" BorderBrush="Transparent" Background="Transparent" &gt; &lt;Border x:Name="InnerBorder" SnapsToDevicePixels="True" BorderThickness="1" CornerRadius="2" BorderBrush="Transparent" Background="Transparent" &gt; &lt;ContentPresenter x:Name="PART_Content" ContentSource="Header" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" /&gt; &lt;/Border&gt; &lt;/Border&gt; &lt;ItemsPresenter x:Name="PART_ItemsHost" Grid.Row="1" Grid.Column="1" Grid.ColumnSpan="2" /&gt; &lt;/Grid&gt; &lt;ControlTemplate.Triggers&gt; &lt;Trigger Property="IsMouseOver" SourceName="OuterBorder" Value="True"&gt; &lt;Setter TargetName="OuterBorder" Property="BorderBrush" Value="Blue" /&gt; &lt;Setter TargetName="OuterBorder" Property="Background" Value="Red" /&gt; &lt;Setter TargetName="InnerBorder" Property="BorderBrush" Value="White" /&gt; &lt;/Trigger&gt; &lt;MultiTrigger&gt; &lt;/ControlTemplate.Triggers&gt; &lt;/ControlTemplate&gt; &lt;/Setter.Value&gt; &lt;/Setter&gt; &lt;/Style&gt; </code></pre>
 

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