Is there a way to make two panels divide a form by 50% without using code?

I've tried to do this using the dock, anchor, and dockpadding properties but I can't figure it out

I placed two panels on a form and set the one
to dock left and the other to dock right, but when I resize the form the midle doesn't fill out

I know how to do this using code I just thought that microsoft would of included such a feature. why didn't they just allow you to specify percentages for the width and height properties. Such a feature would alow panels to act as layout managers.