aistudio-wpf-diagram/AIStudio.Wpf.DiagramDesigner.Demo/ViewModels/Groups/CustomDefinedGroupDesignerItemViewModel.xaml

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"                    
                    xmlns:dd="https://gitee.com/akwkevin/aistudio.-wpf.-diagram"
                    xmlns:viewmodel="clr-namespace:AIStudio.Wpf.DiagramDesigner.Demo.ViewModels">

    <dd:ColorBrushConverter x:Key="ColorBrushConverter" />

    <DataTemplate DataType="{x:Type viewmodel:CustomDefinedGroupDesignerItemViewModel}">
        <Grid IsHitTestVisible="False">
            <TextBlock Text="{Binding Describe}"
                       Foreground="{Binding FontViewModel.FontColor,Converter={StaticResource ColorBrushConverter}}"
                       FontSize="{Binding FontViewModel.FontSize}" 
                       FontFamily="{Binding FontViewModel.FontFamily}"  
                       FontWeight="{Binding FontViewModel.FontWeight}"
                       FontStyle="{Binding FontViewModel.FontStyle}"                         
                       FontStretch="{Binding FontViewModel.FontStretch}"
                       TextDecorations="{Binding FontViewModel.TextDecorations}"
                       HorizontalAlignment="Center" 
                       VerticalAlignment="Bottom"></TextBlock>
        </Grid>
    </DataTemplate>


</ResourceDictionary>