Program hanging when tab control selectedindex changed in code

I am having a problem with a tab control in that when I change the selectedindex in code the program hangs, I have tried using selectedtab as well and the same behaviour occurs.

If I manually change the tab by clicking on it that works, and if I add a command button with the command to change the tab that works as well. I have also tried introducing a delay with a timer and that also fails. I don't know of any way in which to find out what the hang is caused by. Everythng just stops working, but I can stop debugging.

Any ideas anyone?
grwallaceAsked:
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Mike TomlinsonMiddle School Assistant TeacherCommented:
Can you please show us the code that works and that the code that causes the hang?  Gotta start somewhere...
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grwallaceAuthor Commented:
Hi,

There was a datarepeater on the form and it seems to be something to do with that, I have replaced that with a grid to see how I get on
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nishant joshiTechnology Development ConsultantCommented:
r u using timer in your app?
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grwallaceAuthor Commented:
I removed the datarepeater
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grwallaceAuthor Commented:
I had to change the program
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