Bug 146159 [Regression]Changing font operation doesn't work other than the first time
Description: The first time changing operation can work well. However, Change it again, it won't work. Steps: 1.Insert lable/text to layout or master page 2.Change the font from serif to cursive, it works well 3.Change the font again Result: The action doesn't work Additional infor: build number:200606080632
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/editors/schematic/editparts/ReportElementEditPart.java
* 
	 * @param model
	 */
	public ReportElementEditPart( Object model )
	{
		super( );
		if ( Policy.TRACING_EDITPART_CREATE )
		{
			String[] result = this.getClass( ).getName( ).split( "\\." ); 
			System.out.println( result[result.length - 1]
					+ " >> Created for " 
					+ model );
		}
		setModel( model );
		peer = creatDesignElementHandleAdapter();
	}
	
	public DesignElementHandleAdapter creatDesignElementHandleAdapter()
	{
		HandleAdapterFactory.getInstance( ).remove( getModel( ) );
		return HandleAdapterFactory.getInstance( )
				.getDesignElementHandleAdapter( getModel( ), this );
	}
	
	/**
	 * perform edit directly when the request is the corresponding type.
	 */
	public void performRequest( Request request )
	{
		if ( RequestConstants.REQ_OPEN.equals( request.getType( ) )