I would like to add one another thing, it is not related to previous issue, but it is minor thing and it has been already reported, so I think it is not necessary to create a new topic.
It is also related to extended borders (enabled in this case) and another application (window) that is always on top. When my application using AC is restored from minimized state and its overlap some “always on top” window, the content of my form is correctly behind, but extended borders are in front of always of top window. So it is visually corrupted, content of window is correctly hiden but borders are painted.
Here is attached screenshot, Firefox window is set as “always on top” and Beijing Ext skin borders overlap it.
Not critical bug, but it does not look good.
[attachment=6226:ACborderoverlap.png]