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I am struggling with binding to parent DataContext from DataTemplate/ContextMenu control. I've already tried solutions mentioned here and here but with no luck. I'm not able to bind to neither to property or command - no exceptions are thrown, but commands are not invoked and properties are set to null.

Here's my code sample (simplified as its possible):

<Metro:MetroWindow ...> <Window.DataContext> <local:MyViewModel /> </Window.DataContext> <Grid> <Grid.ColumnDefinitions> <ColumnDefinition Width="1*" /> <ColumnDefinition Width="10*" /> <ColumnDefinition Width="1*" /> </Grid.ColumnDefinitions> <StackPanel ... /> <Grid Grid.Column="1"> <Border ... /> <ListBox x:Name="FileList" ItemsSource="{Binding AddedFiles}" Margin="5,5,5,5" SelectionMode="Multiple" SelectionChanged="ItemsSelectionChanged"> <ItemsControl.ItemsPanel> <ItemsPanelTemplate> <WrapPanel MaxWidth="700" IsItemsHost="True"/> </ItemsPanelTemplate> </ItemsControl.ItemsPanel> <ItemsControl.ItemTemplate> <DataTemplate DataType="{x:Type local:FileListItem}"> <Grid Margin="5" Width="110" ToolTip="{Binding Path=TooltipInfo}" MouseDown="FileItemClick" Tag="{Binding DataContext,RelativeSource={RelativeSource Mode=Self}}"> <Grid.ContextMenu> <ContextMenu> <MenuItem Header="{Binding PlacementTarget.Tag.test,RelativeSource={RelativeSource Mode=FindAncestor,AncestorType=ContextMenu}}" /> <MenuItem Header="Test command" Command="{Binding PlacementTarget.Tag.CloseCommand, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=ContextMenu}}"/> </ContextMenu> </Grid.ContextMenu> <Grid.RowDefinitions ... /> <StackPanel ...(Databinding works here!) /> <TextBlock ... (Databinding works here!) /> <Rectangle ... (Databinding works here!) /> </Grid> </DataTemplate> </ItemsControl.ItemTemplate> </ListBox> </Grid> </Grid>

I've tried to bind Tag property with Window's DataContext via RelativeSource too (and other possible solutions found across other topics), but nothing happens. Something must be clearly wrong in my approach.

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  • CloseCommand this command is in FileListItem? Commented Mar 20, 2018 at 11:20
  • @WPFUser Nope, Its inside ViewModel (parent DataContext). Thats the idea - to invoke command from parent DataContext using ContextMenu from single FileListItem Commented Mar 20, 2018 at 11:22
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    then you should be accessing ListBox's DataContext. Not its Item datacontext. Commented Mar 20, 2018 at 11:24

2 Answers 2

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You cannot find PlacementTarget property in Grid. Change your binding like this,

 <MenuItem Header="{Binding PlacementTarget.Tag.test,RelativeSource={RelativeSource Mode=FindAncestor,AncestorType=ContextMenu}}" />

or like,

<MenuItem Header="{Binding Parent.PlacementTarget.Tag.test,RelativeSource={RelativeSource Self}}" />

Also To access ViewModel's command, Access DataContext of ListBox not ListBoxItem,

 <Grid Margin="5" Width="110" ToolTip="{Binding Path=TooltipInfo}" MouseDown="FileItemClick" Tag="{Binding DataContext,RelativeSource={RelativeSource Mode= FindAncestor, AncestorType=ListBox}}">
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1 Comment

Accessing DataContext of ListBoxItem instead of ListBox was the reason of problem - I didn't notice, that relating to Grid gives single list item context. Thanks a lot!
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Have you tried this? (note DataContext added)

<MenuItem Header="{Binding DataContext.PlacementTarget.Tag.test,RelativeSource={RelativeSource Mode=FindAncestor,AncestorType=Grid}}" />
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1 Comment

Unfortunately doesn't change anything, but thanks for reply.

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