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
private List valueList, selectedList;
	private Button add, addAll, remove, removeAll;
	private String currentDataSetName;
	private ArrayList resultList = new ArrayList( );;
	private java.util.List columnList;
	private int selectedColumnIndex;
	private DataEngine engine;
	private String style;
	private java.util.List choiceList;
	/**
	 * Constructs a new instance of the dialog
	 */
	public ImportValueDialog( String style, java.util.List choices )
	{
		super( DLG_TITLE );
		Assert.isTrue( DATA_TYPE_CHOICE_SET.contains( style ) );
		this.style = style;
		this.choiceList = choices;
	}
	protected Control createDialogArea( Composite parent )
	{
		Composite composite = (Composite) super.createDialogArea( parent );
		createColumnSelectionArea( composite );
		createValueSelectionArea( composite );
		UIUtil.bindHelp( composite, IHelpContextIds.IMPORT_VALUE_DIALOG_ID );
		return composite;
	}
	private void createColumnSelectionArea( Composite parent )
	{
		Composite selectionArea = new Composite( parent, SWT.NONE );