I’m currently working on a UI for our inventory system, but I have found a strange problem. When I try to add something new to the widget it simply removes something else from the widget. And if I try to use the Undo (Ctrl+z) then the whole engine crashes every time.
It is a very strange problem, it doesn’t matter what kind of object im trying o add. Same result with everything.
Might this be a bug or am I simply doing something wrong here 
I’m using the 4.5 Preview (Launcher version)
/Oscar Hvarfvén