ELK/FrameworkLocal/UICore/Style/ComboBoxStyle.xaml

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">

    <Style TargetType="ComboBox">
        <Setter Property="FontFamily" Value="Arial,SimSun" />
        <Setter Property="Background" Value="#FFDCF7F6"></Setter>
    </Style>

    <Style TargetType="ComboBox" x:Key="EventComboBox" BasedOn="{StaticResource {x:Type ComboBox}}">
        <Setter Property="Height" Value="28" />
        <Setter Property="FontSize" Value="14" />
    </Style>



    <Style TargetType="ToggleButton" x:Key="ComboxStyleBtn">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate>
                    <!--下拉按钮内部背景色-->
                    <Border x:Name="Back" Background="#56b6e6" BorderThickness="1" BorderBrush="Transparent">
                        <!--下拉按钮内边框-->
                        <Path Name="PathFill" Fill="#03ffea"  Width="10" Height="6" StrokeThickness="0" Data="M5,0 L10,10 L0,10 z" RenderTransformOrigin="0.5,0.5" Stretch="Fill">
                            <Path.RenderTransform>
                                <TransformGroup>
                                    <ScaleTransform/>
                                    <SkewTransform/>
                                    <RotateTransform Angle="180"/>
                                    <TranslateTransform/>
                                </TransformGroup>
                            </Path.RenderTransform>
                        </Path>
                    </Border>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsMouseOver" Value="True">
                            <Setter TargetName="PathFill" Property="Fill" Value="White"></Setter>
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

    <Style TargetType="ToggleButton" x:Key="ComboxStyleBtnLabel">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate>
                    <Label Background="{TemplateBinding Background}" VerticalAlignment="Stretch"  Grid.Column="0" Foreground="{TemplateBinding Foreground}"  BorderThickness="0"   VerticalContentAlignment="Center" HorizontalContentAlignment="Left"   Margin="0"  ></Label>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

    <Style TargetType="ComboBox" x:Key="TopFrameComboBoxStyle">
        <Setter Property="ItemTemplate">
            <Setter.Value>
                <DataTemplate>
                    <ContentControl>
                        <ContentControl.Style>
                            <Style TargetType="ContentControl">
                                <Setter Property="Background" Value="{StaticResource MessagesInformationBackgroundBrush}"/>
                                <Style.Triggers>
                                    <DataTrigger Binding="{Binding Category}" Value="Error">
                                        <Setter Property="Foreground" Value="{StaticResource MessagesErrorForegroundBrush}"/>
                                    </DataTrigger>
                                    <DataTrigger Binding="{Binding Category}" Value="Warning">
                                        <Setter Property="Foreground" Value="{StaticResource MessagesWarningForegroundBrush}"/>
                                    </DataTrigger>
                                    <DataTrigger Binding="{Binding Category}" Value="Information">
                                        <Setter Property="Foreground" Value="{StaticResource MessagesInformationForegroundBrush}"/>
                                    </DataTrigger>
                                </Style.Triggers>
                            </Style>
                        </ContentControl.Style>
                        <Grid>
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition Width="80"/>
                                <ColumnDefinition Width="120"/>
                                <ColumnDefinition Width="80"/>
                                <ColumnDefinition Width="*"/>
                            </Grid.ColumnDefinitions>
                            <TextBlock Grid.Column="0" Text="{Binding UtcTimestamp, Converter={StaticResource UtcTimeToTextConverter}, ConverterParameter=HH:mm:ss.fff}" />
                            <TextBlock Grid.Column="1" Text="{Binding Source}" Margin="8,0,0,0" />
                            <TextBlock Grid.Column="2" Text="{Binding Type}" Margin="8,0,0,0"/>
                            <TextBlock Grid.Column="3" Text="{Binding Message}" Margin="8,0,0,0"/>
                        </Grid>
                    </ContentControl>
                </DataTemplate>
            </Setter.Value>
        </Setter>
    </Style>

    <Style TargetType="ComboBox" x:Key="TopPanelComboBoxStyle">
        <Setter Property="ItemContainerStyle">
            <Setter.Value>
                <!--ComBoxItem-->
                <Style TargetType="ComboBoxItem">
                    <Setter Property="MinHeight" Value="22"></Setter>
                    <Setter Property="MinWidth" Value="60"></Setter>
                    <Setter Property="Template">
                        <Setter.Value>
                            <ControlTemplate TargetType="ComboBoxItem">
                                <Border Name="Back" Background="{TemplateBinding Background}"  >
                                    <ContentPresenter ContentSource="{Binding Source}" VerticalAlignment="Center" HorizontalAlignment="Left" Margin="10,0,0,0" ></ContentPresenter>
                                </Border>
                            </ControlTemplate>
                        </Setter.Value>
                    </Setter>
                </Style>
            </Setter.Value>
        </Setter>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="ComboBox">
                    <Grid>
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="0.7*"/>
                            <ColumnDefinition Width="0.3*" MaxWidth="30"/>
                        </Grid.ColumnDefinitions>
                        <!--文字区域背景和边线样式-->

                        <Border  Grid.Column="0" BorderThickness="1"  BorderBrush="Gray" CornerRadius="1,0,0,1"  >
                            <Label Background="{TemplateBinding Background}" VerticalAlignment="Stretch"  Grid.Column="0" Foreground="{TemplateBinding Foreground}"  BorderThickness="0"   VerticalContentAlignment="Center" HorizontalContentAlignment="Left" Content="{TemplateBinding Text}" Margin="0"  ></Label>
                            <!--<ToggleButton BorderThickness="0" BorderBrush="Gray" Style="{StaticResource ComboxStyleBtnLabel}" IsChecked="{Binding Path=IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}" ClickMode="Press"></ToggleButton>-->
                        </Border>
                        <!--右侧下拉button设置-->
                        <Border Grid.Column="1" BorderThickness="0,1,1,1" BorderBrush="Gray" CornerRadius="0,1,1,0">
                            <ToggleButton BorderThickness="3" BorderBrush="Gray" Style="{StaticResource ComboxStyleBtn}" IsChecked="{Binding Path=IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}" ClickMode="Press"></ToggleButton>
                        </Border>
                        <!--弹出popup整体设置-->
                        <Popup IsOpen="{TemplateBinding IsDropDownOpen}" Placement="Bottom" x:Name="Popup" Focusable="False" AllowsTransparency="True" PopupAnimation="Slide" >
                            <!--弹出popup边框-->
                            <Border CornerRadius="1" BorderBrush="Gray" BorderThickness="1,0,1,1" MaxHeight="{TemplateBinding MaxDropDownHeight}" MinWidth="{TemplateBinding ActualWidth}" x:Name="DropDown" SnapsToDevicePixels="True">
                                <Border.Effect>
                                    <DropShadowEffect Color="LightGray" BlurRadius="2" ShadowDepth="0" Opacity="1"/>
                                </Border.Effect>
                                <!--下拉幕布边界背景设置 MaxHeight="{TemplateBinding MaxDropDownHeight}"-->
                                <ScrollViewer Margin="0,0,0,0"   SnapsToDevicePixels="True" HorizontalScrollBarVisibility="Auto" VerticalScrollBarVisibility="Auto" BorderBrush="Gray" BorderThickness="2" >
                                    <!-- StackPanel 用于显示子级，方法是将 IsItemsHost 设置为 True -->
                                    <StackPanel IsItemsHost="True" KeyboardNavigation.DirectionalNavigation="Contained" Background="LightGray" />
                                </ScrollViewer>
                            </Border>
                        </Popup>
                    </Grid>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

</ResourceDictionary>