OnlineMonitorSystem/HandyControl/HandyControl_Shared/Themes/Styles/GroupBox.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 BasedOn="{StaticResource GroupBoxBaseStyle}" TargetType="GroupBox" />

    <Style x:Key="GroupBox.Small" BasedOn="{StaticResource GroupBoxBaseStyle}" TargetType="GroupBox">
        <Setter Property="hc:TitleElement.MinHeight" Value="20" />
        <Setter Property="hc:TitleElement.MinWidth" Value="20" />
    </Style>

    <Style x:Key="GroupBoxOriginal" BasedOn="{StaticResource GroupBoxOriginalBaseStyle}" TargetType="GroupBox" />

    <Style x:Key="GroupBoxTab" BasedOn="{StaticResource GroupBoxTabBaseStyle}" TargetType="GroupBox" />

    <Style x:Key="GroupBoxTab.Small" BasedOn="{StaticResource GroupBoxTab}" TargetType="GroupBox">
        <Setter Property="hc:TitleElement.MinHeight" Value="20" />
        <Setter Property="hc:TitleElement.MinWidth" Value="20" />
    </Style>

</ResourceDictionary>