Mac:Closing a child dialog causes the main window to be incorrectly brought to front

Child Dialog is always shown behind the parent dialog and further if there are child of child and last child is closed Grand parent widget pops up in front.

Attached example reproduces it:
To reproduce:
1) Left click on child window to spawn a third dialog.
2) Close the third dialog
3) Notice that the main window is brought to front rather than the child window that parented the third dialog.