Hide the border of a tool bar?

[Dark_Tower]

Hi, I need to hide the border of a tool bar and only show its actions because I have only 4 actions in the tool bar and it ocupies all the avaiable space. I've tried not using the tool bar and use flat buttons but the problem is that when the mouse is under the buttons its border is not painted (differing with the QActions in a tool bar). Anybody knows if it's possible in a simple way? I know that a possible solution could be reimplementig the paintEvent of the tool bar but it's a bit "hard"...

PD: I also want to know if it's possible to center the actions in the tool bar