Using x32 Win XP & QTP 11.

I have a dialog that uses a DevExpress.Xtra.Tab

When I change the tabs using the below it hangs the UAT

SwfWindow("myWindow").SwfObject("tcTabControl").Ob ject.SelectedTabPageIndex=2

However if I 1st click through all the tabs manually and then run the above it changes tab and the UAT is fine.

Any ideas ?