Create Pluggable widget with onClick action gives warning, if not selected

Created pluggable widget with onClick function as per the documentation provided by mendix. <propertyGroup caption="Events"> <property key="onChangeAction" type="action" required="false"> <caption>On change</caption> <description/> </property> </propertyGroup> Even after placing required="false”, widget is giving warning "No action specified”. Is their a way to fix this warning, would like to have a proper fix, don't want to Suppress the warning in studioPro.  And I also see that as per document, The action property type doesn't have required attribute. but in other example it was mentioned. its confusing.  I also see this warnings in Gallery widget, Can some one please suggest how can we remove these kind of warnings. 
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