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
{
			te = handle.getTestExpression( );
		}
		if ( designHandle instanceof DataItemHandle
				&& ( (DataItemHandle) designHandle ).getResultSetColumn( ) != null )
		{
			control.add( VALUE_OF_THIS_DATA_ITEM );
		}
		control.add( DEUtil.resolveNull( te ) );
		control.select( control.getItemCount( ) - 1 );
	}
	/**
	 * Refreshes the OK button state.
	 * 
	 */
	private void updateButtons( )
	{
		enableInput( isExpressionOK( ) );
		getOkButton( ).setEnabled( isConditionOK( ) );
	}
	private void enableInput( boolean val )
	{
		operator.setEnabled( val );
		value1.setEnabled( val );
		value2.setEnabled( val );
		valBuilder1.setEnabled( val );
		valBuilder2.setEnabled( val );
		font.setEnabled( val );
		size.setEnabled( val );
		color.setEnabled( val );