I`m making my GUI without helper libraries. I`m not using a mouse, it`s all keyboard driven. It`s a editor not game GUI. 
I keep wandering what makes a GUi balanced.  How many items are enough to be displayed in a given context i.e how do you know for example when to switch from a standard page to tabs. i.e how do you know 30 is enough.    

 Sorry for disharmony in the screenshot, I don`t make things look nice just for the sake of the screenshot. I do agree though that quality is important.