Auto expand text box in panel

[condonethis]

Hello all,

What I'm attempting to do is create a Form with two Panels:

Left - A autosizing panel with a dock fill richtextbox
Right - A constant size panel with buttons and features for editing the text

Effect desired:
When scaling the size of the form you cannot scale smaller than the initial size of the form, but when expanding the panel on the right is anchored to top right while the richtextbox in the left panel will scale infinitely in either height or width dimensions.

I am sure this is likely some simple property of the textbox or the panel, but cannot seem to locate it. I have the panel on the right anchored at constant size, but cannot seem to get the panel left to autoscale on dimension change.

Thanks,
Chad