Checkbox CheckedChanged event getting fired when switching tabs in tab control(.net windows forms)

I have a windows form which contain a tab control. Each tab contains a checkbox and a CheckedChanged event is associated with each of these checkbox. whenever I try to switch from Tab 1 to Tab 2, the checkbox CheckedChanged event is getting fired automatically. I even tried to remove the event handler, but its not working. What can I do to stop this? Thanks in advance.