FPGACoder/HandyControl/HandyControl_Shared/Themes/Styles/ButtonGroup.xaml

<ResourceDictionary
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:hc="clr-namespace:HandyControl.Controls">

    <Style TargetType="hc:ButtonGroup" BasedOn="{StaticResource ButtonGroupBaseStyle}" />

    <Style
        x:Key="ButtonGroupSolid"
        TargetType="hc:ButtonGroup"
        BasedOn="{StaticResource ButtonGroupBaseStyle}">
        <Setter Property="hc:VisualElement.HighlightBorderBrush" Value="{DynamicResource TitleBrush}" />
        <Setter Property="hc:VisualElement.HighlightBackground" Value="{DynamicResource TitleBrush}" />
        <Setter Property="hc:VisualElement.HighlightForeground" Value="{DynamicResource TextIconBrush}" />
    </Style>

</ResourceDictionary>