Wraps a NumericUpDown control in order to display and capture a numeric property of the business object
Inheritance: ControlMapper
 /// <summary>
 /// Handles the value changed event suitably for the UI environment
 /// </summary>
 /// <param name="mapper">The mapper for the NumericUpDown</param>
 public void ValueChanged(NumericUpDownMapper mapper)
 {
     _mapper = mapper;
     var numericUpDown = mapper.GetControl() as NumericUpDown;
     if (numericUpDown == null) return;
     numericUpDown.ValueChanged += ValueChangedHandler;
     numericUpDown.Leave += ValueChangedHandler;
 }