dialog content is not painted

[miso]

Hello,
my original problem was found in PyQt (http://stackoverflow.com/questions/1...-processevents), but it's almost the same when I rewrote in into C++.

My goal is to show some dialog with label (something like "please wait" or whatever) while executing some other code in main thread. Main thread is important because of some error handlings (Qt Dialog with error message) etc later.
Note: I have 2 connects to button.clicked because in pyqt version there were different behaviour (first dialog works fine, second one without label). In C++ version both dialogs aren't repainted.
It seems Splash dialog is not repainted even if QApplication:rocessEvents(); is called. When I remove "delete splash;" line, it's repainted when main thread leaves MyWindow::handleButton method

Thank you for any help or suggestion.

Michal