diff --git a/OpenNest/Forms/EditNestForm.cs b/OpenNest/Forms/EditNestForm.cs
index a41b16a..3a56df9 100644
--- a/OpenNest/Forms/EditNestForm.cs
+++ b/OpenNest/Forms/EditNestForm.cs
@@ -741,6 +741,9 @@ namespace OpenNest.Forms
             };
             assigner.Assign(plate);
 
+            foreach (var lp in PlateView.Parts)
+                lp.IsDirty = true;
+
             PlateView.Invalidate();
         }