How to add custom button inside the list in Windchill GUI

How to add custom button inside the list in ppb menu. codebase\config\actions\ppb-actions.xml

I use this action for launch ajax and it start with default processor.

I try my class  extend by LaunchURLAction, but button does not show

<action name="insertNewEquipmentEstdexWizard" ajax="component">

  <command class="com.ptc.cat.ui.client.action.LaunchURLAction" method="execute" url="netmarkets/jsp/ru/pts/estdex/addNewEquipmentWizard.jsp" windowType="popup"/>

  <supportedTypes>

               <type value="com.ptc.windchill.mpml.processplan.operation.MPMOperation"/>

           </supportedTypes>

  </action>