WPF ContextMenu: How can I tell who launched it?

I have a ContextMenu that can be opened from 2 different StackPanel's, how can I tell which panel actually launched the menu?

Un开发者_运维百科der WinForms I could consult the SourceControl of the ContextMenuStrip to find this information.

TIA, Martin.

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I think, what you're looking for is the PlacementTarget-property of the ContextMenu.