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(Note - this is a re-post as my first question got posted under wrong headline: Here Sorry!) I have a standard WPF treeview and have bound items to view model classes. I now wish to handle behaviour when items are double-clicked (opening documents visual-studio-style). I can get event-handler to fire in the control housing the treeview (xaml shown), but how do I bind to specific behaviour on the view model classes - e.g. ProjectViewModel? Preferable bound to ICommand-implementer, as this is used elsewhere... <TreeView ItemsSource="{Binding Projects}" MouseDoubleClick="TreeView_MouseDoubleClick"> <TreeView.ItemContainerStyle>  <Style TargetType="{x:Type TreeViewItem}"> <Setter Property="IsExpanded" Value="{Binding IsExpanded, Mode=TwoWay}" /> <Setter Property="IsSelected" Value="{Binding IsSelected, Mode=TwoWay}" /> <Setter Property="FontWeight" Value="Normal" /> <Style.Triggers> <Trigger Property="IsSelected" Value="True"> <Setter Property="FontWeight" Value="Bold" /> </Trigger> </Style.Triggers> </Style> </TreeView.ItemContainerStyle> <TreeView.Resources> <HierarchicalDataTemplate DataType="{x:Type Implementations:ProjectViewModel}" ItemsSource="{Binding Children}"> <StackPanel Orientation="Horizontal"> <Image Width="16" Height="16" Margin="3,0" Source="Images\Region.png" /> <TextBlock Text="{Binding DisplayName}" /> </StackPanel> </HierarchicalDataTemplate> <H

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