Hide custom toolbar button dynamically

I have created a button using OIF FPM, but now depending on  a condition would like to hide the button. At the click of the 'Start' button on the 'Initial Screen' I need to check one of the input values and depending on the value either hide or display my button that I added to the toolbar. Anyone know how to do that? I tried looking at the 'Start' button of the Component configuration, but there is no element event id or element id. I also tried debugging through the 'WDDOMODIFYVIEW' of the CRN view of the FPM_OIF_COMPONENT, but could not find anything helpful.