Redraw problem

[A. Arias]

Using WIndowMaker I have this problem:

1) First I open a gnustep app.
2) Open a non gnustep app (over the gnustep app)
3) Switch to other workspace.
4) Back to the original workspace.
5) Minimize the window of the non gnustep app.

the attached screenshot show the result.

redraw-problem.jpg
Description: JPEG image