protected abstract void ChangeList(string list, object element, ListChangedCommand.Type type);
internal void ChangeLst(string list, object element, ListChangedCommand.Type type)
{
ChangeList(list, element, type);
HandlePropertyChanged(list);
}
protected void ExecuteListChangedCommand(string list, object element, ListChangedCommand.Type type)
{
(new ListChangedCommand(this, list, element, type)).Execute();
}