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
catch ( BirtException e )
			{
			}
		}
		return string;
	}
	private String convertToStandardFormat( Date date )
	{
		if ( date == null )
		{
			return null;
		}
		return new DateFormatter( STANDARD_DATE_TIME_PATTERN, ULocale.US ).format( date );
	}
	private String getExpression( String columnName )
	{
		for ( Iterator iter = columnList.iterator( ); iter.hasNext( ); )
		{
			ResultSetColumnHandle cachedColumn = (ResultSetColumnHandle) iter.next( );
			if ( cachedColumn.getColumnName( ).equals( columnName ) )
			{
				return DEUtil.getExpression( cachedColumn );
			}
		}
		
		return columnName;
	}
	private String getColumnName( String expression )
	{
		for ( Iterator iter = columnList.iterator( ); iter.hasNext( ); )