Bug 131243 Open invalid report design.
Open a invalid report design should switch to XML Source editor page and can't switch to other pages, when the source is correct user can switch to layout and other pages.
UI/org.eclipse.birt.report.designer.ui.editors/src/org/eclipse/birt/report/designer/ui/editors/MultiPageReportEditor.java
* Remove all report editor page.
	 */
	public void removeAllPages( )
	{
		for ( int i = pages.toArray( ).length - 1; i >= 0; i-- )
		{
			if ( pages.get( i ) != null )
				this.removePage( ( (IFormPage) pages.get( i ) ).getId( ) );
		}
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.part.EditorPart#doSave(org.eclipse.core.runtime.IProgressMonitor)
	 */
	public void doSave( IProgressMonitor monitor )
	{
		getActivePageInstance( ).doSave( monitor );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.part.EditorPart#doSaveAs()
	 */
	public void doSaveAs( )
	{
		getActivePageInstance( ).doSaveAs( );
		setInput( getActivePageInstance( ).getEditorInput( ) );
		
		IReportProvider provider = EditorUtil.getReportProvider( this,