FPGACoder/HandyControl/HandyControl_Shared/Themes/Styles/Col.xaml

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:hc="clr-namespace:HandyControl.Controls">

    <Style TargetType="hc:Col">
        <Setter Property="Focusable" Value="False"/>
    </Style>

</ResourceDictionary>