[Pharo-users] Browser Panes (or is it Pains??)

I downloaded squeak to try out the UI Generator created by the Haso Plattner Institiute. When I did that I noticed that the squeak system browser has a feature that solves one of my constant annoyances in pharo. The panes of the browser are re-sizeable in the x direction. I can make different panels different sizes. Is there a setting or someway to easily add this capability to the Pharo System Browser? Tony Giaccone