WPF 自定义下拉列表

Popup x:Name="popupStrategy" StaysOpen="False" PopupAnimation="Scroll" Width="190" MaxHeight="300" AllowsTransparency="True">
    Border Background="#0c5ab0" BorderThickness="1" BorderBrush="#1992d6">
        ItemsControl x:Name="itemsCtrlStrategy" Grid.Row="1" Margin="0 5 0 0">
            ItemsControl.Template>
                ControlTemplate>
                    ScrollViewer HorizontalScrollBarVisibility="Auto" MinHeight="{Binding ElementName=itemsCtrlStrategy,Path=ActualHeight}" MinWidth="{Binding ElementName=itemsCtrlStrategy, Path=ActualWidth}">
                        ItemsPresenter>ItemsPresenter>
                    ScrollViewer>
                ControlTemplate>
            ItemsControl.Template>
            ItemsControl.ItemsPanel>
                ItemsPanelTemplate>
                    StackPanel/>
                ItemsPanelTemplate>
            ItemsControl.ItemsPanel>
            ItemsControl.ItemTemplate>
                DataTemplate>
                    StackPanel Orientation="Horizontal" Margin="5 0 5 5" Background="#00234E">
                        Button x:Name="btnStrategySel" Click="btnStrategySel_Click_1" CommandParameter="{Binding}" Width="120" Margin="5" VerticalAlignment="Center" HorizontalAlignment="Center">
                            Button.Template>
                                ControlTemplate>
                                    TextBlock Text="{Binding Info.STRATEGYNAME}" ToolTip="{Binding Info.STRATEGYNAME}" Width="120" Foreground="#1ba4f6" VerticalAlignment="Center" HorizontalAlignment="Center">TextBlock>
                                ControlTemplate>
                            Button.Template>
                        Button>
                        Button x:Name="btnStrategyDel" Margin="5" CommandParameter="{Binding}" Click="btnStrategyDel_Click_1" Height="12" Width="12" VerticalAlignment="Center" HorizontalAlignment="Center">
                            Button.Template>
                                ControlTemplate>
                                    Image Name="img" Width="12" Height="12" VerticalAlignment="Center" Source="/SunCreate.CombatPlatform.Client.Resources;component/Image/CaseExportStrategy/删除.png">Image>
                                ControlTemplate>
                            Button.Template>
                        Button>
                        Button x:Name="btnStrategyEdit" Margin="5" CommandParameter="{Binding}" Click="btnStrategyEdit_Click_1" Height="12" Width="12" VerticalAlignment="Center" HorizontalAlignment="Center">
                            Button.Template>
                                ControlTemplate>
                                    Image Name="img" Width="12" Height="12" VerticalAlignment="Center" Source="/SunCreate.CombatPlatform.Client.Resources;component/Image/CaseExportStrategy/编辑.png">Image>
                                ControlTemplate>
                            Button.Template>
                        Button>
                    StackPanel>
                DataTemplate>
            ItemsControl.ItemTemplate>
        ItemsControl>
    Border>
Popup>

itemsCtrlStrategy.ItemsSource = strategyViewModelList;

popupStrategy.PlacementTarget = sender as Button;
popupStrategy.Placement = PlacementMode.Bottom;
popupStrategy.IsOpen = true;