Question

I am trying to bind the commandParamater of my ContextMenu item to another element on the form, however no matter what I try the commandParamater is always null.

Can someone please show me how to correctly bind the commandParamater of my context menu item?

What I have:

<TreeView.ItemTemplate>
    <HierarchicalDataTemplate ItemsSource="{Binding Path=Files}">
       <Grid>
          <Grid.ContextMenu>
              <ContextMenu>
                 <MenuItem Header="Rename Folder" 
                           Command="{Binding Path=ToggleControlVisability}" 
                          CommandTarget="{Binding ElementName=FolderEditor}" 
                          CommandParameter="{Binding ElementName=FolderEditor}">
                 </MenuItem>
               </ContextMenu>
          </Grid.ContextMenu>

          <Label Content="{Binding Path=FolderName}"></Label>

          <StackPanel Name="FolderEditor" Orientation="Horizontal" 
                      Visibility="Hidden">
              <TextBox Text="{Binding Path=FolderName}"></TextBox>
          </StackPanel>
        </Grid>
     </HierarchicalDataTemplate>
</TreeView.ItemTemplate>

Answer 1

This is a very common problem encountered in WPF; Context menu itself is not part of the same visual tree as the control it was defined on, due to this it’s not possible to use ElementName or RelativeSource bindings.

I have also faced this issue recently and solution using Tag and PlacementTarget worked fine for me.

Here are some posts having different solutions to this problem(apart from one CodeNaked suggested) –

How to set CommandTarget for MenuItem inside a ContextMenu?

http://www.sevensteps.com/binding-contextmenu-commands-in-wpf-to-the-controls-viewmodel.ashx

http://www.ikriv.com/blog/?p=434