void confirmButton_OnButtonClick(MyGuiControlButton sender) { MyContainerDefinition newDefinition = new MyContainerDefinition(); foreach (var addComp in m_containersListBox.SelectedItems) { if (addComp.UserData is MyDefinitionId) { var defId = (MyDefinitionId)addComp.UserData; MyEntity entity = MyEntities.CreateEntityAndAdd(defId, true, m_position); Debug.Assert(entity != null, "Entity wasn't created!"); } } CloseScreen(); }