WPF MahApps NumericUpDown control does not respect the Width property when the value is less than 60.

To define a Width less that 60 you have to also define the MinWidth and MaxWidth to less than 60.

<Controls:NumericUpDown Grid.Row="0"
    Value="{Binding AxisYUpperValue, Mode=TwoWay}"
    Minimum ="0" 
    Maximum ="200"
    Culture="{Binding LocalCulture, Mode=OneWay}"/>

Setting the Width greater than 60 is obayed without needing to set MaxWidth or MinWidth properties.