The question incorrectly refers to messages as being under the Properties tab, but messages correspond to methods, which would typically be found under a Methods tab or equivalent in an IDE. Properties and methods are central to an object's interaction in object-oriented programming.
The question seems to be referring to the concepts of object-oriented programming, where objects in programming have properties and can respond to messages, which are calls to methods (functions) defined within the object's class. However, the Properties tab typically lists an object's properties, which are attributes or data associated with the object, not the messages it can respond to. Messages or methods are generally found in the Methods tab or similar section in a development environment. Functionality such as sending a message to an object is part of what can be defined in its class, and is key to how objects interact within an application.
In conclusion, an object's methods (messages) and properties are fundamental concepts in object-oriented programming and they are pivotal for the object's interaction and behavior within the software.