Hello,

Thank you for the code-snippet you have provided.

1. In order to bind the AllowAddNewRow propety to a boolean property from the ViewModel, you can use a converter inside the binding itself. This way you should be able to respectively pass the necessary data to the AllowAddNewRow (for example: True for Bottom and False for None).

<ig:AddNewRowSettings AllowAddNewRow="{Binding Source={StaticResource viewModel}, 
                                                Path=IsAddNewRowVisible,
                                                Converter={StaticResource addNewConverter}}" />

object IValueConverter.Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
    if (((bool)value) == true)
        return AddNewRowLocation.Bottom;
    else
        return AddNewRowLocation.None;
}

2. In order to add a button to the header area of the XamGrid, an approach I can suggest you is to create a new UnboundField by setting it's HeaderTemplate to a DataTemplate with a Button instance and collapse the cells of the column since no data will be visualized there.

<ig:UnboundColumn Key="#" HeaderTextHorizontalAlignment="Center">
    <ig:UnboundColumn.HeaderTemplate>
        <DataTemplate>
            <Button MinWidth="50" Margin="5" Click="Button_Click">Toggle Bottom/None</Button>
        </DataTemplate>
    </ig:UnboundColumn.HeaderTemplate>

    <ig:UnboundColumn.CellStyle>
        <Style TargetType="ig:CellControl">
            <Setter Property="Visibility" Value="Collapsed" />
        </Style>
    </ig:UnboundColumn.CellStyle>
</ig:UnboundColumn>

In this case, it is best to access the ViewModel as a pre-defined resource instead of as a DataContext. This is because we will not be able to access the DataContext through the AddNewRowSettings  property due to the fact that the AddNewRowSettings is not a visual element.

I have attached a sample that uses the approach from above.

If you have any further questions, please let me know.