>i put a Optiongroup in my form, the "ControlSource" is MSTATUS and the "Value" is 1.
>
>I have define the MSTATUS value to 1 before access the FORM.
>
>But why the first button haven't mark in Optiongroup while running in program. (none of buttons have mark)

Did you check scope for MSTATUS variable. Probably, it went out of scope. Basically, it's not necessary at all to use variables as controlsources, you can just fill/retrieve OptionGroup.Value property programmatically.