private void AssociatedObject_OnAddingNewItem(object sender, AddingNewItemEventArgs addingNewItemEventArgs)
{
AddingNewItem addingNewItem = new AddingNewItem();
Command.Execute(addingNewItem);
addingNewItemEventArgs.NewItem = addingNewItem.NewItem;
}
private void AddNewMainItemButton_Click(object sender, EventArgs e)
{
AddingNewItem?.Invoke();
}
