Customize Application Window

[wysota]

I've realized an application and now I want customize how It appear....
I want remove from titlebar the maximize button (only close button and minimiz button) because It is always showed at maximum size size. How can I do this?
And...I want thet application window is always on top the task bar, simple I want that when I start the applicatio, the taskbar is alway hidden? Any idea?

How about simply showing the window in full screen mode? QWidget::showFullScreen() should be able to do that.

Last question...how can I get the size of the titlebar and change it like I preferr?

You can't do that.