Dockable or at least sizeable "bahavior"

[HaveABeer]

Hello!
Some time ago you introduced "initial code" edit box in class opration details. This was done at the cost of reducing the "behavior" edit box. Since I bet that writing initial code by designers is much less common than describing operation behavior, I regret that the "behavior" box is so small. Enlarging the window enlarges only the "initial code" box. I therefore suggest that the proportion between two boxes should be changable.
The ideal solution would make the "behavior" box dockable (the same as "Notes" box).