自定义group完成

AIStudio.Wpf.DiagramDesigner.Demo/ViewModels/Groups/CustomDefinedGroupDesignerItemViewModel.xaml

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+<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>