Editor Window: How to create a flexible split between areas?

Im currently working on an editor window which is supposed to display two diferent areas, much like the “Project” editor window, where we have the “Assets” on the left and its contents on the right.
I guess i can use BeginArea() to split the window, but i would like to have a line that allow users to manage space inside window. Is there any UI property for Editorwindows?

Thanks in advance

No, there isn’t any ready to use control that comes with Unity. You have to handle it yourself. You should know how the GUI system works on its bare bones. You just need to handle the events yourself.

Take a look at my answer on this question to get a quick crashcourse on GUI programming :wink: