Make a window stay on top and be only active window using QT/C++ -

i on rhel 6 , creating app using c++ , qt. trying make window/app on top , app user can interact with.

i have set: setwindowflags(qt::windowstaysontophint);

but user can still click on different app, comes top. need prevent that.

i able fix adding "show();" after set windowflags.