may be it can help you. Copy files from zip in you designer.war
This plugin add button on panel. Onclick open window with two tabs. Button "OK" - don't work, button "Cancel" - close window.
https://community.jboss.org/servlet/JiveServlet/downloadImage/2-810649-20690/262-80/for+answer+2.png
../js/Plugins/tiny_mce.js - new plugin file. Plugin contains button
../images/tinymce.png - picture for button
../js/Plugins/plugins.xml - add row <plugin source="tiny_mce.js" name="ORYX.Plugins.TinyMCE"/>
../js/Plugins/profiles.xml - <plugin name="ORYX.Plugins.TinyMCE"/> - perhaps unnecessary
../profiles/jbpm.xml - add row <plugin name="ORYX.Plugins.TinyMCE"/>
