class org.eclipse.ui.part.EditorActionBarContributor (implements org.eclipse.ui.IEditorActionBarContributor)
class org.eclipse.ui.part.MultiPageEditorActionBarContributor
class org.eclipse.emf.edit.ui.action.EditingDomainActionBarContributor (implements org.eclipse.jface.action.IMenuListener, org.eclipse.ui.IPropertyListener)
class org.eclipse.emf.ecore.presentation.EcoreActionBarContributor (implements org.eclipse.jface.viewers.ISelectionChangedListener)