VisualWorks Seaside hang up

I am following the second chapter of the Seaside tutorial (http://www.cincomsmalltalk.com/userblogs/cincom/blogView?content=seaside_tutorial2). In the process of trying to establish accessors for BlogRootUI the IDE hangs up. The only action I can take is close of the main window - none of the menus are active.
How do I revert to the previous good image? Since the menus are not active, I need to have another way to revert back to a previous image.
Note: the reason that BlogRootUI did not have accessors is that the Motif apperance of checkboxes was confusing to me. I did not now that the checkboxes need to be pressed to be checked.

Thanks

I modal dialog asking for a declaration was hidden by the browser not allowing anything to be active except for 'close'
My mistake in not realizing this

Solved.