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
IPartListener,
		IReportEditor,
		IColleague
{
	public static final String LayoutMasterPage_ID = "org.eclipse.birt.report.designer.ui.editors.masterpage";
	public static final String LayoutEditor_ID = "org.eclipse.birt.report.designer.ui.editors.layout";
	public static final String XMLSourcePage_ID = "org.eclipse.birt.report.designer.ui.editors.xmlsource";
	private ReportMultiBookPage fPalettePage;
	private ReportMultiBookPage outlinePage;
	private ReportMultiBookPage dataPage;
	private boolean fIsHandlingActivation;
	private long fModificationStamp = -1;;
	protected IReportProvider reportProvider;
	private FormEditorSelectionProvider provider = new FormEditorSelectionProvider( this );
	private boolean isChanging = false;
	private ReportMultiBookPage attributePage;
	
	
	
	
	private static class FormEditorSelectionProvider extends