I have a check box with a logical field as the control source,(family.pri1). The first time you click it, there is no visible change. The second time you click it, it will toggle the field.

I want a single click to change the value of the control source. I have been able to make it work by removing the control source and adding the following code

INIT:
this.value=family.pri

WHEN:

this.value=family.pri

VALID:
replace family.pri1 with !family.pri1
this.value=family.pri1

This does not seem like the right way to do it. Any ideas why just using the control source is not working with a single click?