private bool? GetViewModelResultValueFromUnloadBehavior()
{
bool? result = null;
switch (UnloadBehavior)
{
case UnloadBehavior.CloseViewModel:
result = null;
break;
case UnloadBehavior.SaveAndCloseViewModel:
result = true;
break;
case UnloadBehavior.CancelAndCloseViewModel:
result = false;
break;
}
return result;
}