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    copied!<p>I believe you would need to create a custom style for your combobox and redefine its PopUp section. Pls check here: <a href="http://msdn.microsoft.com/en-us/library/ms752094.aspx" rel="nofollow noreferrer">ComboBox ControlTemplate Example</a> for details on how to customize style for the wpf combobox. Your new Popup section could look like the one below:</p> <pre><code>&lt;Window.Resources&gt; ... &lt;Style x:Key="{x:Type ComboBox}" TargetType="ComboBox"&gt; ... &lt;Setter Property="Template"&gt; &lt;Setter.Value&gt; &lt;ControlTemplate TargetType="ComboBox"&gt; &lt;Grid&gt; &lt;ToggleButton ...&gt; &lt;/ToggleButton&gt; &lt;ContentPresenter ... /&gt; &lt;TextBox x:Name="PART_EditableTextBox" .../&gt; &lt;Popup Name="Popup" Placement="Bottom" IsOpen="{TemplateBinding IsDropDownOpen}" AllowsTransparency="True" Focusable="False" PopupAnimation="Slide"&gt; &lt;Grid Name="DropDown" SnapsToDevicePixels="True" MinWidth="{TemplateBinding ActualWidth}" MaxHeight="{TemplateBinding MaxDropDownHeight}"&gt; &lt;Border x:Name="DropDownBorder" Background="{StaticResource WindowBackgroundBrush}" BorderThickness="1" BorderBrush="{StaticResource SolidBorderBrush}"/&gt; &lt;TabControl&gt; &lt;TabItem Header="Google"&gt; &lt;ScrollViewer Margin="4,6,4,6" SnapsToDevicePixels="True"&gt; &lt;StackPanel IsItemsHost="True" KeyboardNavigation.DirectionalNavigation="Contained" /&gt; &lt;/ScrollViewer&gt; &lt;/TabItem&gt; &lt;TabItem Header="Bing"&gt; &lt;ScrollViewer Margin="4,6,4,6" SnapsToDevicePixels="True"&gt; &lt;StackPanel IsItemsHost="True" KeyboardNavigation.DirectionalNavigation="Contained" /&gt; &lt;/ScrollViewer&gt; &lt;/TabItem&gt; &lt;TabItem Header="Computer"&gt; &lt;ScrollViewer Margin="4,6,4,6" SnapsToDevicePixels="True"&gt; &lt;StackPanel IsItemsHost="True" KeyboardNavigation.DirectionalNavigation="Contained" /&gt; &lt;/ScrollViewer&gt; &lt;/TabItem&gt; &lt;/TabControl&gt; &lt;/Grid&gt; &lt;/Popup&gt; &lt;/Grid&gt; &lt;ControlTemplate.Triggers&gt; ... &lt;/ControlTemplate.Triggers&gt; &lt;/ControlTemplate&gt; &lt;/Setter.Value&gt; &lt;/Setter&gt; &lt;Style.Triggers&gt; ... &lt;/Style.Triggers&gt; &lt;/Style&gt; ... &lt;/Window.Resources&gt; </code></pre> <p>hope this helps, regards</p>
 

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