Hide WindowMinimizeButton of the WindowTitleBar

[tailor]

Hello,

I want hide the MinimizeButton (~Qt::WindowMinimizeButtonHint) of the WindowTitle, but it doesn't work and I don't understand why. I already look in the internet, this and several other forums, etc., but I didn't found an answer which works for me!

I want to realize it by setting the WindowFlags.
I am using OpenSuse 13.1, Qt4.8 and KDE.
I am initializing a QMainWindow(QWidget* parent = 0, Qt::WindowFlags fl = Qt::Dialog))
I also use the setMaximumSize(); function. So the MaximumButton is hidden by default, as I already found out.

At the end i have the ContextHelpButton, the MinimizeButton and the CloseButton in my WindowTitlebar.

By using following code, I can hide the Close Button:
@ setWindowFlags(((this->windowFlags() | Qt::CustomizeWindowHint)
& ~Qt::WindowCloseButtonHint));@
This works fine.

By using following code, I can hide the HelpButton:
@ setWindowFlags(((this->windowFlags() | Qt::CustomizeWindowHint)
& ~Qt::WindowContextHelpButtonHint));@
This works fine, too.

But the same code for the Minimize Button, doesn't work:
@ setWindowFlags(((this->windowFlags() | Qt::CustomizeWindowHint)
& ~Qt::WindowMinimizeButtonHint));@

And I don't understand why.

• Is is not possible with KDE or this Linux version?
• Do I need an other windowManager?
• Must the parent set per default, also if I don't have a parent?
• Is it not possible with QMainWindow?

Any ideas or any other solutions?

Thanx for all hints in advance.

Greez,Tailor