# how to make applications variables boolean

**URL:** <https://tech-community.robotics.abb.com/t/how-to-make-applications-variables-boolean/7288>\
**Category:** ScreenMaker\
**Created:** [July 28, 2016, 6:01pm UTC](https://tech-community.robotics.abb.com/t/how-to-make-applications-variables-boolean/7288 "2016-07-28T18:01:48Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Ciertoro](https://avatars.discourse-cdn.com/v4/letter/c/fbc32d/32.png) [@Ciertoro](https://tech-community.robotics.abb.com/u/Ciertoro)\
**Post date:** [July 28, 2016, 6:01pm UTC](https://tech-community.robotics.abb.com/t/how-to-make-applications-variables-boolean/7288/1 "2016-07-28T18:01:48Z")

</div>

I have problem with Visible(False/True) either a Picture box or Command button. I set "Bind to an Application Variable, create Application Variable type bool a by Events Manager create Event Handler which reads from Robot Rapid Data. And does not like it. Picture or Button change to a visible or invisible. SM Doctor writes that - Dangling Events - events are defined and are not being used.