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/ui/dialogs/HighlightRuleBuilder.java
Button btn = new Button( wrapper, SWT.TOGGLE );
		GridData gdata = new GridData( );
		gdata.widthHint = 22;
		gdata.heightHint = 22;
		btn.setLayoutData( gdata );
		return btn;
	}
	private void updatePreview( )
	{
		String familyValue = getFontFamily( );
		int sizeValue = getFontSize( );
		previewLabel.setFontFamily( familyValue );
		previewLabel.setFontSize( sizeValue );
		previewLabel.setBold( bold.getSelection( ) );
		previewLabel.setItalic( italic.getSelection( ) );
		previewLabel.setForeground( ColorManager.getColor( color.getRGB( ) ) );
		previewLabel.setBackground( ColorManager.getColor( backColor.getRGB( ) ) );
		previewLabel.setUnderline( underline.getSelection( ) );
		previewLabel.setLinethrough( linethrough.getSelection( ) );
		previewLabel.updateView( );
	}
	/**
	 * For newly create highlight rule, transfer the handle as <b>null </b>, or
	 * transfer the handle as current highlight rule handle to be modified.
	 * 
	 * @param handle
	 * @param handleCount
	 *            current highlight rule items count.
	 */
	public void updateHandle( HighlightRuleHandle handle, int handleCount )