create-users-portlet/src/main/webapp/WEB-INF/liferay-display.xml

<?xml version="1.0"?>
<!DOCTYPE display PUBLIC "-//Liferay//DTD Display 6.2.0//EN" "http://www.liferay.com/dtd/liferay-display_6_2_0.dtd">

<display>
	<category name="gCube Enabling Apps">
		<portlet id="CreateUsers" />
	</category>
</display>