[wxlua-users] How do I bring an inactive frame to the front when dragging a file to it?

This looks like it should work, but it won't:
  INPUT:Connect(wx.wxEVT_ENTER_WINDOW,function(E)  FRAME:Show(true)  FRAME:Raise(true)  end)


INPUT is a panel. I've confirmed it works. Actually the enter event is only detected when I let go the dragged file, but that's ok. Trouble is, nothing will set it active. wxWidegts appears to offer no SetActive(), and 'focus' seems to mean something specific to text fields, and there seems to be no way to directly call a frame to appear on top if the pointer is moved into either the frame or a child window. I can make all kinds of stuff happen, but not that. Searching for 'on top', or 'bring to front' and all manner of similar queries draw blanks.