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
&& designHandle instanceof DataItemHandle )
				{
					expression.setText( DEUtil.getColumnExpression( ( (DataItemHandle) designHandle ).getResultSetColumn( ) ) );
				}
				updateButtons( );
			}
		} );
		expression.addModifyListener( new ModifyListener( ) {
			public void modifyText( ModifyEvent e )
			{
				updateButtons( );
			}
		} );
		Button expBuilder = new Button( condition, SWT.PUSH );
		expBuilder.setText( "..." ); 
		gdata = new GridData( );
		gdata.heightHint = 20;
		gdata.widthHint = 20;
		expBuilder.setLayoutData( gdata );
		expBuilder.setToolTipText( Messages.getString( "HighlightRuleBuilderDialog.tooltip.ExpBuilder" ) ); 
		expBuilder.addSelectionListener( new SelectionAdapter( ) {
			public void widgetSelected( SelectionEvent e )
			{
				editValue( expression );
			}
		} );
		operator = new Combo( condition, SWT.READ_ONLY );
		for ( int i = 0; i < OPERATOR.length; i++ )
		{
			operator.add( OPERATOR[i][0] );