WPF Relative source- Cannot find source for binding with reference

wpf binding listbox relativesource
Mateusz Dembski picture Mateusz Dembski · Jun 17, 2013 · Viewed 9.7k times · Source

have you ever have a problem like this:

System.Windows.Data Error: 4 : Cannot find source for binding with reference 'RelativeSource FindAncestor, AncestorType='System.Windows.Controls.UserControl', AncestorLevel='1''. BindingExpression:Path=DataContext; DataItem=null; target element is 'ContextMenu' (Name=''); target property is 'DataContext' (type 'Object')

Code:

<ContextMenu DataContext="{Binding Path=DataContext, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type UserControl}}}"

Context Menu is in the:

ListBox-> ListBoxItemTemplate -> DataGrid -> DataGrid.ContextMenu

I have also another Binding in ListBox control, that works with no problems at all.

Answer

Mateusz Dembski picture Mateusz Dembski · Jun 25, 2013

The solution:

1) Set Tag property on ContextMenu owner to DataContext you wanted. 2) Set DataContext of ContextMenu to 

DataContext="{Binding PlacementTarget, RelativeSource={RelativeSource Self}}

3) Bind your elements like this: 

Name_Of_Property="{Binding Tag.Name_Of_Property}"

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