prevent letting toolbar to be movable in Windows, short question

Here is my code , I want to prevent letting toolbar to be movable in Windows I added this setUnifiedTitleAndToolBarOnMac(true); [in mainwindow.cpp] but it seems doesn’t work on windows Any idea would be appreciated Thanks !http://s21.postimg.org/k7nv7nsfb/Untitled.jpg()()! Link of my code: https://www.dropbox.com/sh/iz82tkn3jb7u26l/fhuC7Ma23x