When using the xamDialogWindow with IsModal set to true, tabbing between the controls in the dialog does not work. I've included xaml.

<UserControl x:Class="WpfApplication1.BaseWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:ig="http://schemas.infragistics.com/xaml" >
    <Grid >
        <ig:XamDialogWindow  Width="300" Height="300" Header="Test" Name="xamDialogWindow1" StartupPosition="Center" IsModal="True" IsTabStop="False">
            <Grid Margin="3,3,3,3">
                <Grid.RowDefinitions>
                    <RowDefinition Height="Auto"></RowDefinition>
                    <RowDefinition Height="Auto"></RowDefinition>
                    <RowDefinition Height="Auto"></RowDefinition>
                    <RowDefinition Height="Auto"></RowDefinition>
                </Grid.RowDefinitions> 

                <TextBox Height="23" HorizontalAlignment="Left" Name="textBox1" VerticalAlignment="Top" Width="120" Margin="3,3,3,3" />
                <TextBox Height="23" HorizontalAlignment="Left" Name="textBox2" VerticalAlignment="Top" Width="120" Grid.Row="1"  Margin="3,3,3,3"/>
                <TextBox Height="23" HorizontalAlignment="Left" Name="textBox3" VerticalAlignment="Top" Width="120" Grid.Row="2"  Margin="3,3,3,3"/>
                <StackPanel Orientation="Horizontal" Grid.Row="3"  Margin="3,3,3,3">
                <Button Content="Button" Grid.Row="3" Height="23" HorizontalAlignment="Left" Name="button1" VerticalAlignment="Top" Width="75" IsDefault="True" />
                <Button Content="Button" Grid.Row="3" Height="23" HorizontalAlignment="Left" Name="button2" VerticalAlignment="Top" Width="75" IsCancel="True" />
                </StackPanel>
            </Grid>
        </ig:XamDialogWindow>
    </Grid>
</UserControl>