Hi, 

I encountered the same issue. However, I do not like to write every style and events from scratch as suggested in the answer. Instead the workaround which I found is to bind Width property of check box instead using ig:CheckBoxSettings.CheckBoxStyle. Note that binding the Visibility property won't work.

<UserControl.Resources>
<helpers:BoolToCheckBoxWidthConverter x:Uid="BoolToCheckBoxWidthConverter"
x:Key="BoolToWidthConverter"/>
</UserControl.Resources>

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<ig:XamDataTree.CheckBoxSettings>
<ig:CheckBoxSettings x:Uid="CheckBoxSettings"
CheckBoxMode="Auto"
CheckBoxVisibility="Visible">
<ig:CheckBoxSettings.CheckBoxStyle>
<Style x:Uid="TreeViewItemStyless" TargetType="{x:Type CheckBox}">
<Setter x:Uid="IsEnabledSetter" Property="IsEnabled" Value="{Binding Data.IsCheckBoxEnabled}"/>
<Setter x:Uid="WidthSetter" Property="Width" Value="{Binding Data.IsCheckBoxVisible, Converter={StaticResource BoolToWidthConverter}}"/>
</Style>
</ig:CheckBoxSettings.CheckBoxStyle>
</ig:CheckBoxSettings>

</ig:XamDataTree.CheckBoxSettings>

internal class BoolToCheckBoxWidthConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
if (value == null)
{
// 20 is the default for the check box
return 20;
}

var bValue = (bool)value;

return bValue ? 20 : 0;
}

public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
var iValue = (int?)value;

return iValue != 0;
}
}