Unwanted image copy of the main dialog

[balexei]

Dear CodeGurus,

In my program I let the user to specify the processing parameters in the main dialog and after the user pushes the "Run" button all the controls on the dialog are disabled (and invisible) and the progress bar is shown which tracks the calculation flow. In the program I want all the controls to stay invisible until the calculations are completed at which point the progress bar should disappear and everything else shows up again.

What is often happening to me is that if the calculation is continuing for a "long" time (a minute or so) the progress bar gets frozen (i.e. does not show progress in the calculations). At the same time, I can move the dialog itself and see that there is a copy of this main dialog under it on which the progress bar is still updating as it should, however the copy of this window can no longer be moved (although the original window can). After the calculations are completed "the copy" of the dialog disappear and the original is enabled and is fully functional as it should be. What I also see, that in the taskbar the tab corresponding to the "new copy" of the dialog appears after I try moving the original dialog, this tab disappears after the calculations are finished.

This situation is illustrated in the attached image - TOP: the "copy" of the dialog that appears after the "original" dialog has been moved - note that the progress bar in the "copy" is constantly updating; MIDDLE: the "original" dialog with frozen progress bar; BOTTOM: taskbar with tabs for both original dialog and its copy.



Can anybody explain what is going on? How can I keep the progress bar in the original dialog going during the whole calculation cycle and skip the creation of the copy?