ComboBox in a ThemedDataGrid

Hi,

I have a ThemedDataGrid using the Dark Theme that has a DataGridComboBoxColumn.  When the DataGridComboBoxColumn is selected and expanded to select an item from it, it is White.  How do I make it match the theme of the ThemedDataGrid so that the user can see what they are selecting without hovering the mouse over each item.

<datagrid:ThemedDataGrid.Columns>
                        <DataGridTextColumn Binding="{Binding Extension}" ClipboardContentBinding="{x:Null}" Header="Extenstion"/>
                        <DataGridTextColumn Binding="{Binding TotalHeaderLines}" ClipboardContentBinding="{x:Null}" Header="Total Header Lines"/>
                        <DataGridTextColumn Binding="{Binding ParameterLine}" ClipboardContentBinding="{x:Null}" Header="Parameter Line"/>
                        <DataGridTextColumn Binding="{Binding GroupLine}" ClipboardContentBinding="{x:Null}" Header="Group Line"/>
                            <DataGridCheckBoxColumn Binding="{Binding DataColumn}" ClipboardContentBinding="{x:Null}" Header="Date Column"/>
                            <DataGridComboBoxColumn
                                ClipboardContentBinding="{x:Null}"
                                Header="Time Format"
                                SelectedValueBinding="{x:Null}"
                                SelectedItemBinding="{Binding TimeFormat}">
                                <DataGridComboBoxColumn.ElementStyle>
                                    <Style TargetType="{x:Type ComboBox}">
                                        <Setter Property="ItemsSource" Value="{Binding Path=DataContext.TimeFormatsList, RelativeSource={RelativeSource AncestorType={x:Type UserControl}}}" />
                                    </Style>
                                </DataGridComboBoxColumn.ElementStyle>
                                <DataGridComboBoxColumn.EditingElementStyle>
                                    <Style TargetType="{x:Type ComboBox}">
                                        <Setter Property="Foreground" Value="Black"/>
                                        <Setter Property="Background" Value="Green"/>
                                        <Setter Property="ItemsSource" Value="{Binding Path=DataContext.TimeFormatsList, RelativeSource={RelativeSource AncestorType={x:Type UserControl}}}" />
                                    </Style>
                                </DataGridComboBoxColumn.EditingElementStyle>
                            </DataGridComboBoxColumn>
                            <DataGridCheckBoxColumn Binding="{Binding DataColumn}" ClipboardContentBinding="{x:Null}" Header="Date Column"/>
                            <DataGridComboBoxColumn
                            ClipboardContentBinding="{x:Null}"
                            Header="Delimeter"
                            SelectedValueBinding="{x:Null}"
                            SelectedItemBinding="{Binding Delimeter}"
                            TextBinding="{x:Null}" />
                        <DataGridTextColumn Binding="{Binding Unit}" ClipboardContentBinding="{x:Null}" Header="Unit"/>
                        <DataGridTextColumn Binding="{Binding LapMarker}" ClipboardContentBinding="{x:Null}" Header="Lap Marker"/>
                    </datagrid:ThemedDataGrid.Columns>
                    <datagrid:ThemedDataGrid.AlternatingRowBackground>
                        <SolidColorBrush Color="#3CF4F4F4" themes:TintGroup.Name="List"/>
                    </datagrid:ThemedDataGrid.AlternatingRowBackground>
                </datagrid:ThemedDataGrid>