Added shutdown method to DynamicGrid, so far for the stock movements and product panel

prs.desktop/Panels/Products/Master List/ProductsPanel.xaml.cs

@@ -83,6 +83,7 @@ namespace PRSDesktop
 
         public void Shutdown(CancelEventArgs? cancel)
         {
+            Products.Shutdown();
         }
 
         public void CreateToolbarButtons(IPanelHost host)

prs.desktop/Panels/Products/Movements/StockMovementPanel.xaml.cs

@@ -107,6 +107,8 @@ public partial class StockMovementPanel : UserControl, IPanel<StockMovement>
 
     public void Shutdown(CancelEventArgs? cancel)
     {
+        Movements.Shutdown();
+        Batches.Shutdown();
     }
 
     private void LoadSettings()