WPF

<pre lang="HTML">
<Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="ComboBox">
                        <Grid>
                            <ToggleButton 
            Name="ToggleButton" 
            Template="{StaticResource ComboBoxToggleButton}" 
            Grid.Column="2" 
            Focusable="false"
            IsChecked="{Binding Path=IsDropDownOpen,Mode=TwoWay,RelativeSource={RelativeSource TemplatedParent}}"
            ClickMode="Press">
                            </ToggleButton>
                            <ContentPresenter
            Name="ContentSite"
            IsHitTestVisible="False" 
            Content="{TemplateBinding SelectionBoxItem}"
            ContentTemplate="{TemplateBinding SelectionBoxItemTemplate}"
            ContentTemplateSelector="{TemplateBinding ItemTemplateSelector}"
            Margin="3,3,23,3"
            VerticalAlignment="Center"
            HorizontalAlignment="Left" />
                            <TextBox x:Name="PART_EditableTextBox"
            Style="{x:Null}" 
            Template="{StaticResource ComboBoxTextBox}" 
            HorizontalAlignment="Left" 
            VerticalAlignment="Center" 
            Margin="3,3,23,3"
            Focusable="True" 
            Background="Transparent"
            Visibility="Hidden"
            IsReadOnly="{TemplateBinding IsReadOnly}"/>
            <Popup Name="Popup" Placement="Bottom" IsOpen="{TemplateBinding IsDropDownOpen}" AllowsTransparency="True" Focusable="False" PopupAnimation="Slide">
               <Grid   Name="DropDown"  SnapsToDevicePixels="True" MinWidth="{TemplateBinding ActualWidth}"  MaxHeight="{TemplateBinding MaxDropDownHeight}">
                                    <Border 
                x:Name="DropDownBorder"
                Background="{StaticResource WindowBackgroundBrush}"
                BorderThickness="1"
                BorderBrush="{StaticResource SolidBorderBrush}"/>
              
                                    <DataGrid
                                            SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"
                                            ItemsSource="{TemplateBinding ItemsSource}"
                                            AutoGenerateColumns="False"
                                            IsReadOnly="True"
                                        GridLinesVisibility="None"
                                        Background="LightGray" 
                                        RowBackground="LightBlue"
                                        AlternatingRowBackground="LightCyan"
                                        SelectedItem="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type Window}}, Path=SelectedIndex}">
                                        <DataGrid.Columns>
                                            <DataGridTextColumn
                                                    Header="Name"
                                                    MinWidth="150"    
                                                    Binding="{Binding Path=Name}"/>
                                            <DataGridTextColumn
                                                    Header="Address"
                                                    MinWidth="200"   
                                                    Binding="{Binding Path=Address}"/>
                                        </DataGrid.Columns>

                                        <DataGrid.CellStyle>
                                            <Style TargetType="DataGridCell">
                                                <Style.Triggers>
                                                    <Trigger Property="IsSelected"  Value="True">
                                                        <!-- try to access directly parrent property-->
                                                        
                                                        <Setter Property="ComboBox.IsDropDownOpen" Value="False"/>
                                                    </Trigger>
                                                </Style.Triggers>
                                            </Style>

<?xml version="1.0" encoding="utf-8"?>
<Wpf>
  <wpfctrl id="NavBtnTemplate">#FFCFDEFF</wpfctrl>
</Wpf>

<UserControl.Resources>
<ControlTemplate x:Key="WpfWebSparkNavTemplate" TargetType="{x:Type Button}">
<Grid x:Name="controlLayout" Height="29.648" Width="84.284">
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="CommonStates">
<VisualState x:Name="Normal"/>
<VisualState x:Name="MouseOver"/>
<VisualState x:Name="Pressed"/>
<VisualState x:Name="Disabled"/>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<Rectangle x:Name="rectangle"Fill="#FFCFDEFF" Margin="0" Height="31" d:LayoutOverrides="VerticalAlignment" >
</Rectangle>

<Label x:Name="buttonCaption" VerticalAlignment = "Center"
HorizontalAlignment = "Center"
FontWeight = "Bold" FontSize = "12" Content="{TemplateBinding Content}"/>
</Grid>
</ControlTemplate>
</UserControl.Resources<UserControl.Resources>
<ControlTemplate x:Key="WpfWebSparkNavTemplate" TargetType="{x:Type Button}">
<Grid x:Name="controlLayout" Height="29.648" Width="84.284">
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="CommonStates">
<VisualState x:Name="Normal"/>
<VisualState x:Name="MouseOver"/>
<VisualState x:Name="Pressed"/>
<VisualState x:Name="Disabled"/>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<Rectangle x:Name="rectangle"Fill="#FFCFDEFF" Margin="0" Height="31" d:LayoutOverrides="VerticalAlignment" >
</Rectangle>

<Label x:Name="buttonCaption" VerticalAlignment = "Center"
HorizontalAlignment = "Center"
FontWeight = "Bold" FontSize = "12" Content="{TemplateBinding Content}"/>
</Grid>
</ControlTemplate>
</UserControl.Resources>
>