У меня есть выпадающий список, который остается открытым, если пользователь не делает выбор.Я хотел бы использовать триггер, чтобы закрыть комбинированный список через 2 секунды.Вот часть моего стиля комбинированного списка, который включает мою неудачную попытку Eventtrigger для достижения этой цели:
<Style x:Key="ComboBoxStyle" TargetType="{x:Type ComboBox}">
<Setter Property="FontFamily" Value="Bryant"/>
<Setter Property="FontSize" Value="18px"/>
<Setter Property="FontWeight" Value="Bold"/>
<Setter Property="FocusVisualStyle" Value="{StaticResource ComboBoxFocusVisual}"/>
<Setter Property="Foreground" Value="#FF000000"/>
<Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Auto"/>
<Setter Property="ScrollViewer.VerticalScrollBarVisibility" Value="Auto"/>
<Setter Property="Padding" Value="4,3"/>
<Setter Property="Margin" Value="5"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ComboBox}">
<Grid x:Name="MainGrid" SnapsToDevicePixels="true">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="0*"/>
<ColumnDefinition/>
<ColumnDefinition MinWidth="{DynamicResource {x:Static SystemParameters.VerticalScrollBarWidthKey}}" Width="0"/>
</Grid.ColumnDefinitions>
<Popup Margin="1" x:Name="PART_Popup" AllowsTransparency="true" StaysOpen="False" IsOpen="{Binding IsDropDownOpen, RelativeSource={RelativeSource TemplatedParent}}" Placement="Bottom" PopupAnimation="{DynamicResource {x:Static SystemParameters.ComboBoxPopupAnimationKey}}" Grid.ColumnSpan="2" Grid.Column="1">
<Border x:Name="DropDownBorder" Background="{DynamicResource GrayBG}" MaxHeight="{TemplateBinding MaxDropDownHeight}" MinWidth="{Binding ActualWidth, ElementName=MainGrid}" BorderBrush="{StaticResource GrayBGBorder}" BorderThickness="2,0,2,2" CornerRadius="0,0,4,4" Width="{Binding ActualWidth, ElementName=DropWidth}">
<ScrollViewer CanContentScroll="true" Template="{DynamicResource NeeboScrollViewer}">
<ItemsPresenter SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" KeyboardNavigation.DirectionalNavigation="Contained"/>
</ScrollViewer>
</Border>
</Popup>
<ToggleButton x:Name="DropWidth" Style="{StaticResource ComboBoxReadonlyToggleButton}" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" Grid.ColumnSpan="2" IsChecked="{Binding IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}" Grid.Column="1"/>
<ContentPresenter HorizontalAlignment="Left" Margin="35,0,0,0" VerticalAlignment="Center" IsHitTestVisible="false" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" Content="{TemplateBinding SelectionBoxItem}" ContentTemplate="{TemplateBinding SelectionBoxItemTemplate}" ContentTemplateSelector="{TemplateBinding ItemTemplateSelector}" Grid.Column="1"/>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="HasItems" Value="false">
<Setter Property="Height" TargetName="DropDownBorder" Value="95"/>
</Trigger>
<Trigger Property="IsEnabled" Value="false">
<Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
<Setter Property="Background" Value="#FFF4F4F4"/>
</Trigger>
<Trigger Property="IsGrouping" Value="true">
<Setter Property="ScrollViewer.CanContentScroll" Value="false"/>
</Trigger>
<EventTrigger RoutedEvent="(Popup.Opened)" SourceName="PART_Popup" >
<BeginStoryboard>
<Storyboard>
<BooleanAnimationUsingKeyFrames Storyboard.TargetName="PART_Popup" Storyboard.TargetProperty="(Popup.IsOpen)">
<DiscreteBooleanKeyFrame KeyTime="00:00:03" Value="False"/>
</BooleanAnimationUsingKeyFrames>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
Есть предложения о том, как этого добиться?