I'm using custom compiled Qt libraries version 4.8.5 with MinGW GCC 4.8.2 along with Qt Creator 3.0.1 and I'm trying to set the sizeHint of two Tab Widgets inside a Horizontal Splitter under the Central Widget in order to have the left tab widget occupy less space than the right one. I found this answer that describes the layout mechanism a little and it says that this can be achieved with the sizeHint widget property. However I can't find find the sizeHint property inside the widget properties panel. There's only sizePolicy, minimumSize and mazimumSize (geometry is locked since it's inside a splitter). Trying to add that property manually gives me a message that the property already exists but I can't find it anywhere.
Does this property exists only in Qt libraries 5x or older 4x versions? Do I have to do this manually in C++ or can be done without programming? Where can I set this property inside the Qt Creator?