I taught Cedar to stand using the method described. Use a treat in front of the nose and move it away as the dog goes to the treat. They will stand. You can put your hand gently under the belly if they stay sitting; they will stand up and understand what you want them to do.
Like any command, it takes a while. Cedar is a year old and has her CGC, but stand is a command that we havent been a diligent with so she's not 100%. I was really proud of her, though, as she did it perfectly to demonstrate to the puppy class the other night. It's taken a year of training for her to do it sporatically. So keep at it! You never know when the lightbulb will go on and she'll get it!
Cedar (tri), Willow (blen), & Holly (ruby)