I applied "Office2kBlack" theam  on XamDataGrid and created Fields and UnboundFields at runtime..

But looking it closely I can see that the Field background macthes with the "Office2kBlack" theam . But UnboundFiled looks like Old Windows 98 field or "LunaNormal"..

Note :- In My whole soulution i havent used any other Theam other then "Office2kBlack" .

XAML

<Style TargetType="{x:Type igDP:CellValuePresenter}" x:Key="_visiblerHeaderRowField">
            <Setter Property="HorizontalContentAlignment" Value="Center"/>
            <Setter Property="VerticalContentAlignment" Value="Center"/>
            <Setter Property="Margin" Value="1,1,1,1"/>
            <Setter Property="ToolTip" Value="{Binding RelativeSource={RelativeSource Self},Path=Value, Converter={StaticResource _limitDetailConvertor}, ConverterParameter=ToolTipSet}"/>
            <EventSetter Event="MouseDown" Handler="CellValuePresenter_MouseDown"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type igDP:CellValuePresenter}">
                        <Grid Background="{TemplateBinding Background}">
                            <ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center" />
                        </Grid>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>

   <Style TargetType="{x:Type igDP:CellValuePresenter}" x:Key="_visiblerHeaderRowFieldLeft" BasedOn="{StaticResource _visiblerHeaderRowField}">
            <Setter Property="ToolTip" Value="{Binding RelativeSource={RelativeSource Self}, Path=Content.Definition.UpdateInformation}"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type igDP:CellValuePresenter}">
                            <Grid Background="{TemplateBinding Background}">
                                <DockPanel LastChildFill="True">
                                    <igEditors:XamCurrencyEditor x:Name="_numberEditor"
                                           Background="Transparent" BorderBrush="Transparent" BorderThickness="0" VerticalAlignment="Center" HorizontalAlignment="Center"
                                           Value="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=Value, Converter={StaticResource _limitAmountCurrencyConvertor},
                                        ConverterParameter=AmountText}" EditModeEnded="_numberEditor_EditModeEnded" EditModeStarted="_numberEditor_EditModeStarted" HorizontalContentAlignment="Left" VerticalContentAlignment="Center">
                                    </igEditors:XamCurrencyEditor>

<igDP:XamDataGrid Name="_grid" GroupByAreaLocation="None" Theme="Office2k7Black" FieldLayoutInitialized="_grid_FieldLayoutInitialized">
</igDP:XamDataGrid>

Code:

     for (int i = 0; i < keyValuePair.Value.Count; i++)
          {
            //LimitUsage limitUsage = keyValuePair.Value[i];
            //string isNet = keyValuePair.Value[i];// limitUsage.Definition.Net ? "Net" : "Gross";

            UnboundField unboundField = new UnboundField();
            unboundField.Settings.LabelTextAlignment = TextAlignment.Center;
            unboundField.Label = (keyValuePair.Value[i]) ? "Net" : "Gross";
            unboundField.Settings.CellValuePresenterStyle = (Style)this.Resources["_visiblerHeaderRowFieldLeft"];
            unboundField.Converter = new LimitSetupConvertor(keyValuePair.Key, keyValuePair.Value[i]);
            unboundField.Tag = headerField;
            unboundField.Column = headerField.Column + i;
            unboundField.Row = 1;
            unboundField.Settings.AllowEdit = true;
            unboundField.Name = headerField.Name + "_" + unboundField.Label;
            _grid.FieldLayouts[0].Fields.Add(unboundField);
            fields.Add(unboundField);
          }
          headerField.Tag = fields;

And I dont think headerPresenter has anything to do with Convertor. Please help Ui looks very very bad.