How do I switch in between corresponding.h or.c/. m documents in Xcode 4?

In Xcode 3 I can click a switch in the leading - right edge of the code editor to switch in between header and also execution (. c or.m) documents. Currently in Xcode 4 there is no switch similar to this around the editor. This would certainly be a lot more valuable currently than it was with Xcode 3, due to the fact that I would certainly such as to click a class in the Symbol sight to bring up the relevant.h documents, after that click a switch or key-board faster way and also reach the.m documents.