Using Build 139 (and in all other builds as far as i can tell), i was trying to 
edit a class that had an associated form. I closed the form window and 
component inspector, and wanted to get back at it again. Should be available in 
the context menu on the src editor to "Go to Form" and perhaps "Go to Inspector" 
As far as I can tell, the only way to get back at the form is to:

1)
  a) go to the view menu and get the Component Inspector
  b) right click the top node of the COmponent Inspector and "Go to Form"

2) 
  a) go to the Explorer, and find the form node for that class. 
  b) Right click on this node and find the menu items "Go to Form" "Go to 
Inspector" , "Go to source"