VB.net controls not working

This is probably a really stupid question question and I suspect I've changed some property somewhere by accident but I can't figure what so I'm going to ask my stupid question anyway. I have a few forms in a simple project and everything was working fine until yesterday. Today everything works fine until I get to the third form when matters start to go awry. I can click a checkbox and the tick appears in the box. Previously this would change the width of the groupbox it was in, now nothing happens. When I tick the cancel button, the same happens - it 'clicks' but the code behind it doesn't kick in! None of the buttons or code seems to work - What have I done wrong? It's a simple program that creates word documents based on values from the forms - since yesterday I changed the namespace ( I changed it back though and nothing happened), added a tab control and a few buttons and radio buttons but that's it. Any suggestions would be most welcome!
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Shiju SasidharanConnect With a Mentor Assoc Project ManagerCommented:
Goto event of the control which is not working  
check whether it has got "Handles" keyword at the end like

Private Sub Button1_Click( ByVal sender As System.Object, ByVal e As System.EventArgs)  Handles Button1.Click

Mike TomlinsonConnect With a Mentor Middle School Assistant TeacherCommented:
"added a tab control"

So you probably changed the "container" of your controls by moving them no?

The IDE sometimes removes the "Handles xxx.yyy" part when you do this.  See shijusn's remark...
BozMAuthor Commented:
Thanks for that lads, nice to know why it happened as well as how to fix the problem.
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