Depends where the control is you are trying to find...
If you are trying to find a control in the parent page, you would use
Parent.Page.FindControl("controlID");
If you are trying to find a control within the user control's own control
collection then you would use
this.FindControl("controlID");
Not quite sure what Page.FindControl does when called from within a
UserControl but it never seems to be of any use as it always returns null.
Use the above methods and you should find the control you're looking for.
Matt
http://www.3internet.co.uk