deserialize method

Implementation

@override
void deserialize(XmlElement xml) {
  // deserialize
  super.deserialize(xml);

  // properties
  label = Xml.get(node: xml, tag: 'label');
  label ??= Xml.get(node: xml, tag: 'text'); // backwards compatibility
  label ??= Xml.get(node: xml, tag: 'value'); // backwards compatibility
  backgroundcolor = Xml.get(node: xml, tag: 'backgroundcolor');
}