I have a Canon 5d Mark II with my battery grip fitted (Canon BG-E6, with1 Canon LP-E6's), & the grip switched 'on', should the Main (to select shutter speed) Dial on the Camera body work, or do I need to use the Dial on the Battery Grip exclusively?

I am having some problems using the Main Dial, with the Grip connected, when the on/off switch on the grip is "on" the main speed dial on the camera won't work, is this supposed to work this way?


I have also have a 40D with the canon grip and even when the battery grip switch is on and the battery grip dial is being usedthe dial on the camera continues to work. (both dialswork perfectly)


I hope anyone could help me about this, because i find it frustrating.