This was broken by Revision 4958 which changed the initialization order for Group.
- Added in a call to childAdded, which calls createChildren(). This call always should have been there, and it was luck that it worked for the various test cases.
- Added in a call to trigger a layout pass. This ensures that the initialized property is set to true.
QE Notes: Need to add a mustella test for GraphicElement mask
Doc Notes: None