Use a sizer for the frame to make sure its initial and minimal size correspond to the best size of the panel inside it. Also add a Layout() call on the panel which was somehow not done initially. And finally don't centre the frame, this is unnecessary. git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@64380 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775