VRCMelonAssistant/VRCMelonAssistant/Styles/ToggleButton.xaml

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <Style TargetType="{x:Type ToggleButton}">
        <Setter Property="Foreground" Value="{DynamicResource SystemColors.ControlTextBrushKey}" />
        <Setter Property="Padding" Value="2" />
        <Setter Property="BorderThickness" Value="1" />
        <Setter Property="Background" Value="Transparent" />
        <Setter Property="BorderBrush" Value="{DynamicResource ComboBoxOutline}" />
        <Setter Property="HorizontalAlignment" Value="Stretch" />
        <Setter Property="VerticalAlignment" Value="Stretch" />
        <Setter Property="HorizontalContentAlignment" Value="Center" />
        <Setter Property="VerticalContentAlignment" Value="Center" />
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type ToggleButton}">
                    <Grid>
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="*" />
                            <ColumnDefinition Width="Auto" SharedSizeGroup="ComboBoxButton" />
                        </Grid.ColumnDefinitions>
                        <Border
                            Padding="{TemplateBinding Padding}"
                            HorizontalAlignment="{TemplateBinding HorizontalAlignment}"
                            VerticalAlignment="{TemplateBinding VerticalAlignment}"
                            Background="{TemplateBinding Background}"
                            BorderBrush="{TemplateBinding BorderBrush}"
                            BorderThickness="{TemplateBinding BorderThickness}"
                            Opacity="0.5"
                            SnapsToDevicePixels="True">
                            <Path
                                Name="ArrowDownPath"
                                Margin="5"
                                HorizontalAlignment="Right"
                                VerticalAlignment="Center"
                                Data="M2.5,0 L8.5,0 L5.5,3"
                                Fill="{DynamicResource ComboBoxArrow}" />
                        </Border>
                    </Grid>
                    <ControlTemplate.Triggers>
                        <Trigger Property="ToggleButton.IsChecked" Value="true">
                            <Setter Property="BorderBrush" Value="{DynamicResource ComboBoxOutline}" />
                            <Setter Property="Background" Value="{DynamicResource ComboBoxSelected}" />
                        </Trigger>
                        <Trigger Property="UIElement.IsMouseOver" Value="True">
                            <Setter Property="BorderBrush" Value="{DynamicResource ComboBoxHighlighted}" />
                            <Setter Property="Background" Value="{DynamicResource ComboBoxHighlighted}" />
                        </Trigger>
                        <Trigger Property="UIElement.IsKeyboardFocused" Value="True">
                            <Setter Property="BorderBrush" Value="{DynamicResource ComboBoxHighlighted}" />
                            <Setter Property="Background" Value="{DynamicResource ComboBoxHighlighted}" />
                        </Trigger>
                        <MultiTrigger>
                            <MultiTrigger.Conditions>
                                <Condition Property="UIElement.IsMouseOver" Value="True" />
                                <Condition Property="ToggleButton.IsChecked" Value="true" />
                            </MultiTrigger.Conditions>
                            <Setter Property="BorderBrush" Value="{DynamicResource ComboBoxHighlighted}" />
                            <Setter Property="Background" Value="{DynamicResource ComboBoxSelected}" />
                        </MultiTrigger>
                        <MultiTrigger>
                            <MultiTrigger.Conditions>
                                <Condition Property="UIElement.IsKeyboardFocused" Value="True" />
                                <Condition Property="ToggleButton.IsChecked" Value="true" />
                            </MultiTrigger.Conditions>
                            <Setter Property="BorderBrush" Value="{DynamicResource ComboBoxHighlighted}" />
                            <Setter Property="Background" Value="{DynamicResource ComboBoxSelected}" />
                        </MultiTrigger>
                        <Trigger Property="IsPressed" Value="True">
                            <Setter Property="BorderBrush" Value="{DynamicResource ComboBoxClicked}" />
                            <Setter Property="Background" Value="{DynamicResource ComboBoxClicked}" />
                        </Trigger>
                        <Trigger Property="IsEnabled" Value="False">
                            <Setter Property="Foreground" Value="{DynamicResource SystemColors.GrayTextBrushKey}" />
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

</ResourceDictionary>