XP SP2,XP SP3,..,Win7 32-64bit
Tk 8.5.9 ,8.6.0 (but not 8.4.*)
1) start any application, for example: notepad.exe
2) start ..>Demos>TK
Miscellaneous > 2. A dialog box with a local grab.
3) click on Task_Manager/Show_Desktop button
4) click on Task_Manager/notepad.exe icon (or any others Task_Manager icons)
Oops.. (Tk application minimized forever)
Bug #3009450 ?