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/ui/dialogs/ParameterDialog.java
{
	private static final String CHOICE_NO_DEFAULT = Messages.getString( "ParameterDialog.Choice.NoDefault" ); 
	private static final String GROUP_PROPERTIES = Messages.getString( "ParameterDialog.Group.Properties" ); 
	private static final String GROUP_MORE_OPTION = Messages.getString( "ParameterDialog.Group.MoreOption" ); 
	private static final String LABEL_NAME = Messages.getString( "ParameterDialog.Label.Name" ); 
	
	
	private static final String LABEL_DATETIME_PROMPT = "Please enter date values as: MM/DD/YYYY hh:mm:ss AM/PM"; 
	private static final String LABEL_PROMPT_TEXT = Messages.getString( "ParameterDialog.Label.PromptText" ); 
	private static final String LABEL_PARAM_DATA_TYPE = Messages.getString( "ParameterDialog.Label.DataType" ); 
	private static final String LABEL_DISPALY_TYPE = Messages.getString( "ParameterDialog.Label.DisplayType" ); 
	private static final String LABEL_DEFAULT_VALUE = Messages.getString( "ParameterDialog.Label.DefaultValue" ); 
	private static final String LABEL_HELP_TEXT = Messages.getString( "ParameterDialog.Label.HelpText" ); 
	private static final String LABEL_LIST_OF_VALUE = Messages.getString( "ParameterDialog.Label.ListOfValue" ); 	
	private static final String LABEL_VALUES = Messages.getString( "ParameterDialog.Label.Value" ); 
	private static final String LABEL_FORMAT = Messages.getString( "ParameterDialog.Label.Format" ); 
	private static final String LABEL_LIST_LIMIT = Messages.getString( "ParameterDialog.Label.Listlimit" );