Capitalizing custom methods in a SDK based project

In projects which need heavy SDK usage, like Android and iOS development, I want the methods/functions I write to be obvious and since the whole framework is written with lower case method names I would like to have my method names start with upper case.

However is this a good approach if there are going to be other programmers included in the project? Would this create mental overhead & confusion or would it really simplify things?

{
    didReceiveMemoryWarning(); // obviously a framework method
    MemoryWarning(); // obviously custom method

    item.height(); // obviously a framework method
    item.SeventhDimensionOfItem(); // obviously custom extension
}