My form have 1 spinner, 1 editbox, 3 checkbox and 1 containner also!

That should not make any difference.

BTW, it will be no harm done to add that code [IF TYPE('toControl')#'O'.....] also, right?

It will just make it slower - TYPE() is very slow to execute. If you feel that you must add this check, you would be better off to use VARTYPE() - it is faster.