CODEWITHSUNDEEP
wpf
Andrew Stephens
Andrew Stephens

Reputation: 10203

Strange issue - mouse click in popup is getting captured by control underneath

I'm displaying a Popup in response to a button click (popup.IsOpen = true;). The popup contains a ComboBox, and when I click an item in the combobox, one of the things the SelectionChanged event does is to hide the popup.

The Popup appears over a DataGrid that I also have on my page, and I'm finding that the mouse-click on the combobox is also being picked up by a MouseUp event that I've got on the DataGrid. Any idea what's going on?

Upvotes: 6

Views: 2047

Answers (2)

Sugrue
Sugrue

Reputation: 3749

I've hit the same issue. Oddly, it doesn't happen when the code is run in the debugger - it only happens in the release version. It really seems to be a bug in WPF. Trying to catch the click and set the event to handled doesn't work.

My workaround is to, when the popup opens, to tell the control underneath to ignore the click.

Upvotes: 0

Mash
Mash

Reputation: 1536

The MouseUp Event has a routing strategy of type Bubbling. Events that use this type of strategy get passed up the chain to parent controls. Since the Popup is a child of the DataGrid, the event will "bubble" up to the DataGrid. If you would rather the event not bubble, you can try using PreviewMouseUp, which has a Tunneling routing strategy, and will "tunnel" down the chain to child controls. Here is a decent overview of Routing Strategies.

Upvotes: 3

Related Questions