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!