[ https://issues.jboss.org/browse/DROOLS-3674?page=com.atlassian.jira.plugi... ] Michael Anstis commented on DROOLS-3674: ---------------------------------------- [~danielezonca] DMN just uses https://www.patternfly.org/pattern-library/widgets/#popover The issue you'll have is using a DOM component (the popover) with the Canvas _cell_ Mouse Over Event. DMN only shows the popover in response to an _edit_ action. So I have a Lienzo Double Click Event handler attached to the Grid that adds a DIV to the DOM at the mouse pointer position, adds the popover HTML to the content and programmatically shows the popover. You'd need to add the DIV to the DOM in the column renderer for invalid cells, add the popover HTML to the DIV and suitable Bootstrap configuration to handle the hover state... but then again you probably knew this much :-) -- This message was sent by Atlassian Jira (v7.12.1#712002)