Hiding certain UI elements from Eclipse RCP

We can achieve this by using "org.eclipse.ui.activities" extension point.

http://blog.vogella.com/2009/07/13/eclipse-activities/


We also use "Perspective Extensions" extension.
Example:

<extension

         point="org.eclipse.ui.perspectiveExtensions">

      <perspectiveExtension

            targetID="com.kk.StudioPerspective">

         <hiddenToolBarItem

               id="new.group">

         </hiddenToolBarItem>

      </perspectiveExtension>

   </extension>