[flexcoders] tab navigation with TitleWindow not working

[hansen2027]

I am creating a popup dialog (using a <mx:TitleWindow/> with focus set
to the first child (<mx:TextArea). When I hit the tab key, focus is
lost from the TitleWindow and is grabbed  by the browser address
field. Continued tabbing never returns to the dialog. This doesn't
happen with FireFox, only Internet Explorer 7. Is there something I
need to set in the TitleWindow or in the children of the TitleWindow
to prevent the loss of focus when tabbing?