3rdpartylibs/fastreports.wpf/FastReport.Forms.WPF/CustomControls/ToolStripSplitButton.xaml

<local:DropDownButtonBase Style="{DynamicResource ButtonStyle1}" x:Class="CustomControls.ToolStripSplitButton"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:local="clr-namespace:CustomControls">
    <Button.Resources>
        <SolidColorBrush x:Key="Button.Static.Background" Color="Transparent"/>
        <SolidColorBrush x:Key="Button.Static.Border" Color="Transparent"/>
        <SolidColorBrush x:Key="Button.MouseOver.Background" Color="#FFBEE6FD"/>
        <SolidColorBrush x:Key="Button.MouseOver.Border" Color="#FF3C7FB1"/>
        <SolidColorBrush x:Key="Button.Arrow.Background" Color="#FF404040"/>
        <Style x:Key="ButtonStyle1" TargetType="{x:Type local:DropDownButtonBase}">
            <Setter Property="FocusVisualStyle" Value="{x:Null}"/>
            <Setter Property="Background" Value="{DynamicResource Button.Static.Background}"/>
            <Setter Property="BorderBrush" Value="{DynamicResource Button.Static.Border}"/>
            <Setter Property="BorderThickness" Value="1"/>
            <Setter Property="HorizontalContentAlignment" Value="Center"/>
            <Setter Property="VerticalContentAlignment" Value="Center"/>
            <Setter Property="Padding" Value="1"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type local:ToolStripSplitButton}">
                        <DockPanel x:Name="panel1">
                            <Border x:Name="split" DockPanel.Dock="Right" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="0,1,1,1" SnapsToDevicePixels="true">
                                <Path x:Name="arrow" Margin="2" Fill="{DynamicResource Button.Arrow.Background}" Data="M 0 0 L 3 3 L 6 0 Z" HorizontalAlignment="Center" VerticalAlignment="Center"/>
                            </Border>
                            <Border x:Name="border" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Padding="{TemplateBinding Padding}">
                                <StackPanel x:Name="panel2" Orientation="Horizontal" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}">
                                    <Image x:Name="image" Source="{TemplateBinding Image}" Width="{TemplateBinding ImageWidth}" Height="{TemplateBinding ImageHeight}" Margin="1,1,2,0"/>
                                    <TextBlock x:Name="text" Text="{TemplateBinding Text}" Margin="4,0,4,0" TextWrapping="Wrap"/>
                                </StackPanel>
                            </Border>
                        </DockPanel>
                        <ControlTemplate.Triggers>
                            <Trigger Property="IsMouseOver" SourceName="split" Value="true">
                                <Setter Property="Background" TargetName="split" Value="{DynamicResource Button.MouseOver.Background}"/>
                            </Trigger>
                            <Trigger Property="IsMouseOver" SourceName="border" Value="true">
                                <Setter Property="Background" TargetName="border" Value="{DynamicResource Button.MouseOver.Background}"/>
                            </Trigger>
                            <Trigger Property="IsMouseOver" Value="true">
                                <Setter Property="BorderBrush" TargetName="border" Value="{DynamicResource Button.MouseOver.Border}"/>
                                <Setter Property="BorderBrush" TargetName="split" Value="{DynamicResource Button.MouseOver.Border}"/>
                            </Trigger>
                            <Trigger Property="IsVertical" Value="true">
                                <Setter Property="DockPanel.Dock" TargetName="split" Value="Bottom"/>
                                <Setter Property="Orientation" TargetName="panel2" Value="Vertical"/>
                                <Setter Property="Height" TargetName="split" Value="16"/>
                                <Setter Property="BorderThickness" TargetName="split" Value="1,0,1,1"/>
                                <Setter Property="TextAlignment" TargetName="text" Value="Center"/>
                                <Setter Property="Data" TargetName="arrow" Value="M0,0 L4,4 L8,0"/>
                                <Setter Property="Fill" TargetName="arrow" Value="{x:Null}"/>
                                <Setter Property="Stroke" TargetName="arrow" Value="{DynamicResource Button.Arrow.Background}"/>
                            </Trigger>
                            <Trigger Property="IsDropDownOpen" Value="true">
                                <Setter Property="Background" TargetName="border" Value="{DynamicResource Button.MouseOver.Background}"/>
                                <Setter Property="BorderBrush" TargetName="border" Value="{DynamicResource Button.MouseOver.Border}"/>
                                <Setter Property="Background" TargetName="split" Value="{DynamicResource Button.MouseOver.Background}"/>
                                <Setter Property="BorderBrush" TargetName="split" Value="{DynamicResource Button.MouseOver.Border}"/>
                            </Trigger>
                            <Trigger Property="IsEnabled" Value="false">
                                <Setter Property="Opacity" TargetName="image" Value="0.3"/>
                                <Setter Property="Opacity" TargetName="text" Value="0.5"/>
                                <Setter Property="Opacity" TargetName="arrow" Value="0.5"/>
                            </Trigger>
                            <Trigger Property="Image" Value="{x:Null}">
                                <Setter Property="Visibility" TargetName="image" Value="Collapsed"/>
                            </Trigger>
                            <Trigger Property="Text" Value="">
                                <Setter Property="Visibility" TargetName="text" Value="Collapsed"/>
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
    </Button.Resources>
</local:DropDownButtonBase>