Bug - select sizer type dialog stuck behind frame

When adding a grid sizer to a frame the "select sizer type" dialog becomes stuck behind the frame when the frame is pinned to the front. 

Steps to reproduce:
Create a new file.
Create a new frame.
Push the pin button to make the frame always appear in the foreground. 
Push the gridsizer button.
Click on the frame.

Depending on where you place your frame the dialog may be fully or partly covered by the frame. If the top of the dialog is fully covered there is no way to reposition it. If you try to move the frame out of the way the dialog will just move with it.

Thank you.