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
underline = createToggleButton( fstyle );
		underline.setImage( ReportPlatformUIImages.getImage( AttributeConstant.TEXT_UNDERLINE ) );
		underline.addSelectionListener( new SelectionAdapter( ) {
			public void widgetSelected( SelectionEvent e )
			{
				isUnderlineChanged = true;
				previewLabel.setUnderline( underline.getSelection( ) );
				previewLabel.redraw( );
			}
		} );
		underline.setToolTipText( Messages.getString( "HighlightRuleBuilderDialog.tooltip.Underline" ) );
		linethrough = createToggleButton( fstyle );
		linethrough.setImage( ReportPlatformUIImages.getImage( AttributeConstant.TEXT_LINE_THROUGH ) );
		linethrough.addSelectionListener( new SelectionAdapter( ) {
			public void widgetSelected( SelectionEvent e )
			{
				isLinethroughChanged = true;
				previewLabel.setLinethrough( linethrough.getSelection( ) );
				previewLabel.redraw( );
			}
		} );
		linethrough.setToolTipText( Messages.getString( "HighlightRuleBuilderDialog.tooltip.Text_Line_Through" ) );
		Composite back = new Composite( innerParent, SWT.NONE );
		back.setLayoutData( new GridData( GridData.FILL_HORIZONTAL ) );
		glayout = new GridLayout( 1, false );
		back.setLayout( glayout );
		lb = new Label( back, 0 );
		lb.setText( Messages.getString( "HighlightRuleBuilderDialog.text.BackgroundColor" ) ); 
		backColor = new ColorBuilder( back, 0 );
		gdata = new GridData( );