Help!! UserControl missing!!!

Hi there,

I created a very simple button usercontrol. It works fine. BUT... whenever the form loses focus (with the button on it) and regain the focus the button is gone. There is only a white space where the button should be. When I click on the white space the button's resize handles apprears. When I double-click the white space, the button's code page appears. The only problem is that I cannot SEE the button. The button appears again when I close the form ans reopen it. Any ideas? Thanx a lot.