If I have a TabStrip containing some textboxes. When I switch tab, I want to check data in the textboxes before the new tab activates. If I find wrong data in a textbox, I want to interrupt the change of TabStrib. I have tried to use the eventhandler "Private Sub TabStrip1_Change()". However, this event occurs after the new tab is activated. Then it is too late. I would like to have an eventhandler like "Private Sub TabStrip1_BeforeChange()", but it doesn't exist.

Any suggestions?