I believe that’s a bug. I tried to crawl up the list of toolstrip parents to get to the ContextStripMenu owner, which worked, but the SourceControl property was always null. It looks like the common work around is to set the control on the opening of the context menu: private Control menuSource; cms.Opening += cms_Opening; … Read more
The ContextMenuStrip SourceControl (the reference of the current Control where the Context Menu is activated) can be retrieved, from a ToolStripMenuItem, inspecting the OwnerItem reference and moving upstream until the OwnerItem reference is null, then inspecting the Owner value, which references the ContextMenuStrip. (Unfortunately, the SourceControl reference is only available in the ContextMenuStrip control). A … Read more
For a ContextMenu: The problem is that the sender parameter points to the item on the context menu that was clicked, not the context menu itself. It’s a simple fix, though, because each MenuItem exposes a GetContextMenu method that will tell you which ContextMenu contains that menu item. Change your code to the following: private … Read more