how do i show a button based on the value of another button (value is greater then 0)

I'm am building a form in indesign, and just want to add a visual icon next to buttons when they are filled out... check mark next to a drop down list... so the list have values and i want the check mark (button) to show only when the value of the drop list is greater then 0... can this be done?... easily?....

thank you!