http://bugs.winehq.org/show_bug.cgi?id=23180
--- Comment #13 from Dmitry Timoshkov dmitry@codeweavers.com 2010-06-24 23:19:05 --- (In reply to comment #12)
On Windows, TREPCAD behaves as follows:
Upon startup, the stair selection child window is displayed without any controls and has the focus. The main window is in the background, all window controls are displayed and not greyed out; the main window itself is (as it does not have focus). Clicking the main window's controls doesn't do anything.
As soon as I select a stair, the child window disappears and the main window gets the focus. The window controls get active then.
This sounds similar to the description in the comment #10.