https://community.appian.com/discussions/f/user-interface/6646/question-on-dynamically-showing-buttonsIn my form I have 3 buttons that will show only if a product is selected but when I unselect the product, the buttons are still showing. When it first loads the buttons don&#39;t appear, I use the same isnull() within the validations in my grid to make sureen-USTelligent Community 12https://community.appian.com/thread/26165?ContentTypeID=1Fri, 08 Jan 2016 01:55:52 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:f429e2af-8c45-4a1e-84ad-3089d5e78f1bmjmalletThanks.. the rule!APN_isEmpty works like a charm! :)<div style="clear:both;"></div>https://community.appian.com/thread/26164?ContentTypeID=1Fri, 08 Jan 2016 01:52:20 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:75b3bf21-da65-49e1-991a-71d2bfdfe2basikhivahans@mjmallet I would like to suggest you to use rule!APN_isEmpty if the environment in which you are already working has Appian common objects. Just to let you know, isnull won't work all the times, and practitioners often use rule!APN_isBlank or rule!APN_isEmpty. I am suggesting the usage of rule!APN_isEmpty, as the null check is being made against an array.<br /><br />In addition to the above, further I would like to suggest to check for presence of values in local!gridSelection.selected by debugging its value.<div style="clear:both;"></div>