Made DoChanged virtual again

inabox.wpf/DynamicGrid/DynamicGrid.cs

@@ -137,10 +137,9 @@ public abstract class DynamicGrid<T> : DynamicGrid, IDynamicGridUIComponentParen
     
     protected virtual void Changed()
     {
-        
     }
 
-    public void DoChanged()  
+    public virtual void DoChanged()  
     {
         Changed();
         OnChanged?.Invoke(this, EventArgs.Empty);