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Dear Andre, I think I found out the cause. As Tab control doesn’t come with a validation method before changing to a different tab, therefore, I had to keep track of which tab I am currently on by using a variable saving the tab index.

 It has something to do with the logic I setup that confused the program… as a result, it failed with a NullReference error. 

So far it seems to be operational.  Thank you for your reply.  I’ll test it out some more to see if it does fix the problem for good or not. 

Imported from legacy forums. Posted by James (had 868 views)