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dhtmlxWindow header bar disappears when tabbing

In IE7, tabbing through elements in the window causes the window's header bar to disappear. This doesn't seem to happen in IE6 or the other browsers I've tested (I haven't tested IE8).

Here's an example with which to test:
http://www.netcaffeine.com/test/dhtmlxwindow.html
Click in the form field and tab past the button.

I am also able to see the issue on one of your sample pages:
dhtmlxWindows > Integration with Other Components > Attaching Status/Menu/Toolbar Together
Just click anywhere in the text in the window, and hit tab.