Hi all,
i have question about create themes for application.
I would like have options in menu which allow user to change theme between white ( like office 2013 white )
and for example visual studio 2013 ( blue ) as you can see on the images.

theme visual.jpg
white theme.jpg

how do it in qt?
I should change pallete in QtDesigner? I try but I can't change background color some widgets like QMenuBar or QToolButton.
Or I should use Qt Style Sheets? And how to switch between them?