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    copied!<p>Normally the property IsDropDown effects the popup,i edited the combobox template so the popup and the togglebutton who controls it- would be bined to other property -Tag </p> <pre><code> &lt;Style x:Key="ComboBoxStyle1" TargetType="{x:Type ComboBox}"&gt; &lt;Setter Property="Template"&gt; &lt;Setter.Value&gt; &lt;ControlTemplate TargetType="{x:Type ComboBox}"&gt; &lt;Grid x:Name="MainGrid" SnapsToDevicePixels="true"&gt; &lt;Grid.ColumnDefinitions&gt; &lt;ColumnDefinition Width="*"/&gt; &lt;ColumnDefinition MinWidth="{DynamicResource {x:Static SystemParameters.VerticalScrollBarWidthKey}}" Width="0"/&gt; &lt;/Grid.ColumnDefinitions&gt; &lt;Popup x:Name="PART_Popup" StaysOpen="True" AllowsTransparency="true" Grid.ColumnSpan="2" IsOpen="{Binding Tag, RelativeSource={RelativeSource TemplatedParent}}" Margin="1" PopupAnimation="{DynamicResource {x:Static SystemParameters.ComboBoxPopupAnimationKey}}" Placement="Bottom"&gt; &lt;Microsoft_Windows_Themes:SystemDropShadowChrome x:Name="Shdw" Color="Transparent" MaxHeight="{TemplateBinding MaxDropDownHeight}" MinWidth="{Binding ActualWidth, ElementName=MainGrid}"&gt; &lt;Border x:Name="DropDownBorder" BorderBrush="{DynamicResource {x:Static SystemColors.WindowFrameBrushKey}}" BorderThickness="1" Background="{DynamicResource {x:Static SystemColors.WindowBrushKey}}"&gt; &lt;ScrollViewer x:Name="DropDownScrollViewer"&gt; &lt;Grid RenderOptions.ClearTypeHint="Enabled"&gt; &lt;Canvas HorizontalAlignment="Left" Height="0" VerticalAlignment="Top" Width="0"&gt; &lt;Rectangle x:Name="OpaqueRect" Fill="{Binding Background, ElementName=DropDownBorder}" Height="{Binding ActualHeight, ElementName=DropDownBorder}" Width="{Binding ActualWidth, ElementName=DropDownBorder}"/&gt; &lt;/Canvas&gt; &lt;ItemsPresenter x:Name="ItemsPresenter" KeyboardNavigation.DirectionalNavigation="Contained" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/&gt; &lt;/Grid&gt; &lt;/ScrollViewer&gt; &lt;/Border&gt; &lt;/Microsoft_Windows_Themes:SystemDropShadowChrome&gt; &lt;/Popup&gt; &lt;ToggleButton BorderBrush="{TemplateBinding BorderBrush}" Background="{TemplateBinding Background}" Grid.ColumnSpan="2" IsChecked="{Binding Tag, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}" Style="{StaticResource ComboBoxReadonlyToggleButton}"/&gt; &lt;ContentPresenter ContentTemplate="{TemplateBinding SelectionBoxItemTemplate}" ContentTemplateSelector="{TemplateBinding ItemTemplateSelector}" Content="{TemplateBinding SelectionBoxItem}" ContentStringFormat="{TemplateBinding SelectionBoxItemStringFormat}" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" IsHitTestVisible="false" Margin="{TemplateBinding Padding}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/&gt; &lt;/Grid&gt; &lt;ControlTemplate.Triggers&gt; &lt;Trigger Property="HasDropShadow" SourceName="PART_Popup" Value="true"&gt; &lt;Setter Property="Margin" TargetName="Shdw" Value="0,0,5,5"/&gt; &lt;Setter Property="Color" TargetName="Shdw" Value="#71000000"/&gt; &lt;/Trigger&gt; &lt;Trigger Property="HasItems" Value="false"&gt; &lt;Setter Property="Height" TargetName="DropDownBorder" Value="95"/&gt; &lt;/Trigger&gt; &lt;Trigger Property="IsEnabled" Value="false"&gt; &lt;Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/&gt; &lt;Setter Property="Background" Value="#FFF4F4F4"/&gt; &lt;/Trigger&gt; &lt;Trigger Property="IsGrouping" Value="true"&gt; &lt;Setter Property="ScrollViewer.CanContentScroll" Value="false"/&gt; &lt;/Trigger&gt; &lt;Trigger Property="ScrollViewer.CanContentScroll" SourceName="DropDownScrollViewer" Value="false"&gt; &lt;Setter Property="Canvas.Top" TargetName="OpaqueRect" Value="{Binding VerticalOffset, ElementName=DropDownScrollViewer}"/&gt; &lt;Setter Property="Canvas.Left" TargetName="OpaqueRect" Value="{Binding HorizontalOffset, ElementName=DropDownScrollViewer}"/&gt; &lt;/Trigger&gt; &lt;/ControlTemplate.Triggers&gt; &lt;/ControlTemplate&gt; &lt;/Setter.Value&gt; &lt;/Setter&gt; &lt;/Style&gt; </code></pre> <p>then if you want to open\close the combobox you just need to set his Tag property to True\False :</p> <pre><code>&lt;ComboBox Style="{DynamicResource ComboBoxStyle1}" Tag="True"/&gt; </code></pre>
 

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