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 void clearArea( Composite area )
	{
		Control[] children = area.getChildren( );
		for ( int i = 0; i < children.length; i++ )
		{
			children[i].dispose( );
		}
	}
	private void updateTableButtons( )
	{
		boolean isEnable = true;
		SelectionChoice selectedChoice = null;
		if ( valueTable.getSelection( ).isEmpty( ) )
		{
			isEnable = false;
		}
		else
		{
			selectedChoice = (SelectionChoice) ( (IStructuredSelection) valueTable.getSelection( ) ).getFirstElement( );
			
			
			
			
		}
		boolean isDefault = isEnable && isDefaultChoice( selectedChoice );
		if ( isDefault )
		{
			changeDefault.setText( BUTTON_LABEL_REMOVE_DEFAULT );
		}
		else