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[news.eclipse.newcomer] How to filter a TreeViewer to not display the parent, but show the children 
My structure has the following (where each level is a different class
type):

DocumentRoot
+- MyExplorer
 +-Tree1
  ---item1
  ---item2
 +-Tree2
  ---item3
  ---item4

I am trying to filter my TreeViewer to only display:
Tree1
  ---item1
  ---item2
Tree2
  ---item3
  ---item4

I can't seem to figure out how to do this with the ViewerFilter--if I
try to filter a parent class, I lose the children.
I would also be happy with a solution to just print the tree starting
at a certain level (if that's simpler)

Thanks