Bug 168808 Display text is lost after launching import values dialog
Steps to reproduce: 1.new a parameter; 2.select list box control type; 3.press "Import Values" button to import some values; 4.assign display texts for the imported values; 5.press "Import Values" button to launch import values dialog again; 6.press ok button on dialog; Expected result: The previous assigned display texts are remained. Actual result: The previous display texts are lost.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/dialogs/ImportValueDialog.java
null,
					null,
					null ) );
		}
		catch ( BirtException e )
		{
			ExceptionHandler.handle( e );
			return false;
		}
		dataSetChooser.setItems( ChoiceSetFactory.getDataSets( ) );
		dataSetChooser.select( 0 );
		currentDataSetName = dataSetChooser.getText( );
		selectedList.removeAll( );
		for ( Iterator iter = choiceList.iterator( ); iter.hasNext( ); )
		{
			selectedList.add( (String) iter.next( ) );
		}
		refreshColumns( );
		return true;
	}
	private void refreshColumns( )
	{
		DataSetHandle dataSetHandle = getDataSetHandle( );
		try
		{
			columnList = DataUtil.getColumnList( dataSetHandle );
		}
		catch ( SemanticException e )
		{
			ExceptionHandler.handle( e );