protected override void ClearItems()
{
var oldVal = this.Items.ToList();
_undoManager.AddUndoAction(() =>
{
foreach (var it in oldVal)
{
base.Add(it);
}
});
base.ClearItems();
}
/// <summary>
/// Call PropertyChanged event if not null
/// </summary>
/// <param name="property">Property that has changed</param>
protected void NotifyPropertyChanged(string property, Action undoAction)
{
_undoManager.AddUndoAction(undoAction);
NotifyPropertyChanged(property);
}