Is CodeSense dumb? Or am I?

OK, this is weird. I declare a method in the header file for a class. Then I switch over to the implementation file. I want to implement the method… and I need to type out its name. CodeSense doesn't offer to autocomplete it. Is that a feature? Or can't it read the header file?

Then, when I begin to type an expression that sends a message, as in [myObject performMethod], why doesn't CodeSense offer performMethod as a prominent autocompletion option? And when I want to access a property with the dot syntax… No CodeSensing for me. Am I supposed to keep in mind all method and instance variable names I declared, at all times, and get no help?