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
e.doit = ( "0123456789\0\b\u007f".indexOf( e.character ) != -1 ); 
			}
		} );
		Label values = new Label( limitArea, SWT.NULL );
		values.setText( Messages.getString( "ParameterDialog.Label.values" ) ); 
		values.setLayoutData( new GridData( GridData.FILL_HORIZONTAL ) );
		
		createLabel( moreOptionSection, null ); 
		Composite checkBoxArea = new Composite( moreOptionSection, SWT.NONE );
		checkBoxArea.setLayout( UIUtil.createGridLayoutWithoutMargin( 2, false ) );
		checkBoxArea.setLayoutData( new GridData( GridData.FILL_BOTH ) );
		allowNull = new Button( checkBoxArea, SWT.CHECK );
		allowNull.setText( CHECKBOX_ALLOW_NULL );
		addCheckBoxListener( allowNull, CHECKBOX_ALLOW_NULL );
		allowBlank = new Button( checkBoxArea, SWT.CHECK );
		allowBlank.setText( CHECKBOX_ALLOW_BLANK );
		addCheckBoxListener( allowBlank, CHECKBOX_ALLOW_BLANK );
		doNotEcho = new Button( checkBoxArea, SWT.CHECK );
		doNotEcho.setText( CHECKBOX_DO_NOT_ECHO );
		addCheckBoxListener( doNotEcho, CHECKBOX_DO_NOT_ECHO );
		isHidden = new Button( checkBoxArea, SWT.CHECK );
		isHidden.setText( CHECKBOX_HIDDEN );
		addCheckBoxListener( isHidden, CHECKBOX_HIDDEN );
		needSort = new Button( checkBoxArea, SWT.CHECK );
		needSort.setText( CHECKBOX_SORT );
		addCheckBoxListener( needSort, CHECKBOX_SORT );
	}
	/**
	 * Set the input of the dialog, which cannot be null
	 *