Run attached application.

Click "hierarchical order".

Click "init".

In stage0 click win.

In stage1 click winwin.

in stage3 click app.

now click of button dismiss on stage1, now click on button dismiss on stage2.

You see, that order of stages 3 and 4 has changed during clicking. There was no such effect on windowsOS: the last APPLICATION_MODAL window is always over all other stages.