erratic tab control selection changed behaviour

I have a tab control with two tab items situated on 3/4 of a wpf page. Each tab item has a number of buttons, combo boxes etc.

If I select the tab items (flick back and forth a couple of times), and then click on a button outside the tab control, the tab control selection changed event fires and the previous selected tab item is displayed. The impression I get is that the button click event is trying to close the tab item. How do i trap this.?

its somewhat similar to the tabcontrol behaviour described in this thread.

regards.

http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=2357515&SiteID=1