expand property

bool get expand

@override
bool get expand => false;

set expand (dynamic v)

set expand(dynamic v)
{
  if (_expand != null)
  {
    _expand!.set(v);
  }
  else if (v != null)
  {
    _expand = BooleanObservable(Binding.toKey(id, 'expand'), v, scope: scope, listener: onPropertyChange);
  }
}