Below are some styles I use to round the corners and set the alternating row colors of all of my XamComboEditors.

The next thing I want to do is change the ComboBoxItem’s  mouse-over appearance in the dropdown list.  However, I have not figured out how to reference the ComboBoxItems in the dropdown list using a control template. I’m wanting to make the mouse-over appearance similar to what we see in the XamDataGrid when using the Aero theme.  I was hoping I could extend the style below to make this happen.  Any good ideas?

Big thanks in advance!

<!--  CornerRadius size for all of my data entry controls  -->
<CornerRadius x:Key="StandardControlCornderRadius">3</CornerRadius>
<SolidColorBrush x:Key="DataControlValidBorder" Color="#FF4F85B7"/>

<!--  Formating for the XamCombo style -  Thanks to Andrew Smith !!!   -->
<AlternationConverter x:Key="alternationIndexToBackground">
    <SolidColorBrush Color="White" />
    <SolidColorBrush Color="#FFF4F8F9" />
</AlternationConverter>

<Style TargetType="ComboBoxItem" x:Key="alternatingItem">
    <Setter Property="Background"
        Value="{Binding RelativeSource={RelativeSource Self},
        Path=(ItemsControl.AlternationIndex),
        Converter={StaticResource alternationIndexToBackground}}"/>
</Style>

<Style TargetType="ComboBox" x:Key="alternatingCombo">
    <Setter Property="ItemContainerStyle" Value="{StaticResource alternatingItem}" />
    <Setter Property="AlternationCount" Value="2" />
</Style>

<Style TargetType="{x:Type igEditors:XamComboEditor}">
    <Setter Property="ComboBoxStyle" Value="{StaticResource alternatingCombo}" />
    <Setter Property="EditTemplate">
    <Setter.Value>
        <ControlTemplate TargetType="{x:Type igEditors:XamComboEditor}">
            <Border
    x:Name="MainBorder"
    Background="{TemplateBinding Background}"
    BorderBrush="{TemplateBinding BorderBrush}"
    BorderThickness="{TemplateBinding BorderThickness}"
                CornerRadius="{DynamicResource StandardControlCornderRadius}">
             
                <ComboBox
     Name="PART_FocusSite"
     Padding="{TemplateBinding Padding}"
     HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}"
     VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}"
     IsReadOnly="{TemplateBinding ReadOnly}"
     Background="Transparent"
     BorderBrush="Transparent"
     BorderThickness="0,0,0,0"
     ContextMenu="{TemplateBinding ContextMenu}"
     IsDropDownOpen="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=IsDropDownOpen, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
     Style="{TemplateBinding ComboBoxStyle}"
     IsEditable="{TemplateBinding IsEditable}"
     SelectedValuePath="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=ItemsProvider.ValuePath}"
     DisplayMemberPath="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=ItemsProvider.DisplayMemberPath}"
     MaxDropDownHeight="{TemplateBinding MaxDropDownHeight}"
     igEditors:XamComboEditor.ComboEditor="{Binding RelativeSource={RelativeSource TemplatedParent},Path=.}"
                    />
            </Border>
        
            <ControlTemplate.Triggers>
                <Trigger Property="IsInEditMode" Value="True">
                    <Setter Property="IsTabStop" Value="False" />
                </Trigger>
            </ControlTemplate.Triggers>
        </ControlTemplate>
    </Setter.Value>
</Setter>
</Style>