diff -r 593a658cba8e -r 73e448b2943d src/model.h
--- a/src/model.h	Thu Oct 03 11:45:44 2019 +0300
+++ b/src/model.h	Thu Oct 03 23:44:28 2019 +0300
@@ -13,6 +13,8 @@
 	Model(const Model&) = delete;
 	int size() const;
 	EditContext edit();
+signals:
+	void objectAdded(modelobjects::Id id, int position);
 private:
 	template<typename T, typename... Args>
 	T* append(Args&&... args);
@@ -23,18 +25,25 @@
 	using ModelObjectPointer = std::unique_ptr<modelobjects::BaseObject>;
 	LDHeader header;
 	std::vector<ModelObjectPointer> body;
+	std::map<modelobjects::Id, modelobjects::BaseObject*> objectsById;
 };
 
 template<typename T, typename... Args>
 T* Model::append(Args&&... args)
 {
 	this->body.push_back(std::make_unique<T>(args...));
-	return static_cast<T*>(this->body.back().get());
+	T* pointer = static_cast<T*>(this->body.back().get());
+	this->objectsById[pointer->id] = pointer;
+	emit objectAdded(pointer->id, this->body.size() - 1);
+	return pointer;
 }
 
 template<typename T, typename... Args>
 T* Model::insert(int position, Args&&... args)
 {
 	this->body.insert(position, std::make_unique<T>(args...));
-	return this->body[position];
+	T* pointer = static_cast<T*>(this->body[position]);
+	this->objectsById[pointer->id] = pointer;
+	emit objectAdded(pointer->id, position);
+	return pointer;
 }