title: UiBinder Dynamic DockPanel
body: <p>Simple Question ....
  If I have a StackLayoutPanel on the left, I want to click it  have a dynamically loaded
  widget in my DockLayoutPanel on right ... similar to the GWt example
  <a href="http://gwt.google.com/samples/Mail/Mail.html" rel="nofollow noreferrer">http://gwt.google.com/samples/Mail/Mail.html</a>.. where clicking anything under mailboxes
  would trigger a different widget on right...</p>