For "Advanced Stage", "Close me" button can not work correctly.

The actual results:
For "Advanced Stage", "Close me" button can not work correctly.
The Advanced Stage will change to Minimized state after clicking on "Close me" button.
If we click the Minimize Stage,the stage will come back to Desktop again.Please refer to AdvancedStage.png
By the way,the issue happend on trying several times for step5 and step6.