Comment 3 for bug 1568016

The dialog is created with the context of the Page. When closing the dialog, it starts to fade out, and then the page is popped (and destroyed) before the dialog fade-out is finished. This makes the context of the dialog invalid, and the ScriptAction that makes the dialog invisible (and destroys it) is not executed. Because of this, the dialog stays active (but with opacity 0) and blocks events from getting to the active page.