diff --git a/Workspace/client/src/main/java/com/pqt/client/gui/modules/stock_screen/StockScreenModel.java b/Workspace/client/src/main/java/com/pqt/client/gui/modules/stock_screen/StockScreenModel.java
index 429120eb..cc5a39b1 100644
--- a/Workspace/client/src/main/java/com/pqt/client/gui/modules/stock_screen/StockScreenModel.java
+++ b/Workspace/client/src/main/java/com/pqt/client/gui/modules/stock_screen/StockScreenModel.java
@@ -35,15 +35,15 @@ class StockScreenModel {
     }
 
     void commitProductDeletion(Product product) {
-
+        stockService.commitUpdate(stockService.getNewUpdateBuilder().removeProduct(product));
     }
 
     void commitProductModification(Product oldProduct, Product newProduct) {
-
+        stockService.commitUpdate(stockService.getNewUpdateBuilder().modifyProduct(oldProduct, newProduct));
     }
 
     void commitProductAddition(Product product) {
-
+        stockService.commitUpdate(stockService.getNewUpdateBuilder().addProduct(product));
     }
 
     void addListener(IStockScreenModelListener l){
diff --git a/Workspace/client/src/main/java/com/pqt/client/module/stock/UpdateBuilder.java b/Workspace/client/src/main/java/com/pqt/client/module/stock/UpdateBuilder.java
index 36826f26..f471916b 100644
--- a/Workspace/client/src/main/java/com/pqt/client/module/stock/UpdateBuilder.java
+++ b/Workspace/client/src/main/java/com/pqt/client/module/stock/UpdateBuilder.java
@@ -16,20 +16,23 @@ public class UpdateBuilder {
         toModify = new HashMap<>();
     }
 
-    public void addProduct(Product product) {
+    public UpdateBuilder addProduct(Product product) {
         if(!toAdd.contains(product)){
             toAdd.add(product);
         }
+        return this;
 	}
 
-	public void removeProduct(Product product) {
+	public UpdateBuilder removeProduct(Product product) {
         if(toRemove.contains(product)){
             toRemove.remove(product);
         }
+        return this;
 	}
 
-	public void modifyProduct(Product oldVersion, Product newVersion) {
+	public UpdateBuilder modifyProduct(Product oldVersion, Product newVersion) {
         toModify.put(oldVersion, newVersion);
+        return this;
 	}
 
 	public List<ProductUpdate> build() {