Bug 169393 Outline switch action isn't disappear after double clicking the Matser Page element on report outline
Open a report design, and active the improved XML editor, double click the master page element on report outline. Then, it will switch to the MasterPage editor, and the outline switch action isn't disappear on toolbar menu on outline view.
UI/org.eclipse.birt.report.designer.ui.editors/src/org/eclipse/birt/report/designer/ui/editors/MultiPageReportEditor.java
{
					ReportRequest r = new ReportRequest( );
					r.setType( ReportRequest.LOAD_MASTERPAGE );
					r.setSelectionObject( request.getSelectionModelList( ) );
					SessionHandleAdapter.getInstance( )
							.getMediator( )
							.notifyRequest( r );
				}
			} );
		}
	}
	/**
	 * Returns current page instance if the currently selected page index is not
	 * -1, or <code>null</code> if it is.
	 * 
	 * @return active page instance if selected, or <code>null</code> if no
	 *         page is currently active.
	 */
	public IFormPage getCurrentPageInstance( )
	{
		int index = getCurrentPage( );
		if ( index != -1 )
		{
			Object page = pages.get( index );
			if ( page instanceof IFormPage )
				return (IFormPage) page;
		}
		return null;
	}
}