Version: 2017.2
public Object context ;


Context is the object that is the target of a menu command.

Usually the context is the current selection or the item under the mouse when invoking a context menu.

    // Add context menu named "Do Something" to context menu
    @MenuItem ("CONTEXT/Rigidbody/Do Something")
    static function DoSomething (command : MenuCommand) {
        var body : Rigidbody = command.context;
        body.mass = 5;