ms access - option button value -1 when selected -

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i have option button has control source. button not part of option group. when button not selected stores 0 (which want) however, when option button selected stores -1 instead of 1. cannot seem find property in menu set option value.

is there way set storage value when selected 1 not -1?

i tried me.controls("optionbuttoncontrolname").optionvalue = 1 got error.

i know do: 

if (optbtn.value = -1)     optbtn.value = 1 end if

each time button clicked there has easier way i'm not seeing.

thanks!

in access (and in vba in general recall) true value -1. option button (and other control boolean value setting in vb/vba) show value when true.

a less verbose option might grab absolute value of control:

myvalue = abs(optbtn.value)

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