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Researching my books and can't find an answer....
When I call a dialog from a menu selection, it appears in front of the main window, but when I call it directly from a function, it appears behind the main window.
The question is, how to insure it will appear in front of the main window when called from a function?
May be you can explicitly specify the z-value of your dialog
when you create the dialog，you must give it a parent。like this：
QMessageBox msbox(mainform);
the message box will show at center of mainform.
Just for those who might experience the same problem...
The difficulty was that the dialog was actually launching before the main window because of where the call to it was - in mainwindow.cpp
After moving the call to main.cpp, after the mainwindow was shown, no problem. It shows up on top.