优化

InkCanvas.Controls/BoardToolbarButton.xaml

@@ -25,6 +25,8 @@
                             <DrawingGroup ClipGeometry="M0,0 V24 H24 V0 H0 Z">
                                 <GeometryDrawing x:Name="IconGeometryInternal"
                                                  Brush="{DynamicResource IconForeground}" />
+                                <GeometryDrawing x:Name="IconGeometryInternal2"
+                                                 Brush="{DynamicResource IconForeground}" />
                             </DrawingGroup>
                         </DrawingImage.Drawing>
                     </DrawingImage>

InkCanvas.Controls/BoardToolbarButton.xaml.cs

@@ -90,6 +90,7 @@ namespace Ink_Canvas.Controls
         public event MouseButtonEventHandler ButtonMouseUp;
 
         public GeometryDrawing IconGeometryDrawing => IconGeometryInternal;
+        public GeometryDrawing IconGeometryDrawing2 => IconGeometryInternal2;
 
         public Border ButtonBorderControl => ButtonBorder;