Hello,

In order to control the selection type for the rows of the XamGrid by using a boolean property in the ViewModel class, I can suggest you use the XamGrid.SelectionSettings.RowSelection property by binding it for the boolean property with a converter. The converter will be used for converting the boolean values - true, false and null to SelectionType values - Multiple, Single, None.

This way whenever the boolean property gets changed, the RowSelection for the XamGrid will change accordingly.

ViewModel:

public bool? AllowMultipleSelection { get; set; }

XAML:

<ig:XamGrid.SelectionSettings>
    <ig:SelectionSettings RowSelection="{Binding Source={StaticResource viewModel},
                                                    Path=AllowMultipleSelection,
                                                    Converter={StaticResource converter}}" />
</ig:XamGrid.SelectionSettings>

Code-behind:

object IValueConverter.Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
    var allowMultipleSelection = value as bool?;
           
    switch(allowMultipleSelection)
    {
        case true:  return SelectionType.Multiple;
        case false: return SelectionType.Single;
        case null:  return SelectionType.None;
        default:    return SelectionType.None;
    }           
}

I have attached a sample application that demonstrates the approach from above.

If you have any questions, please let me know.