I remember these days, laying on the supermarket floor refusing to move, arching their back so you can not strap them into the buggie! Now they are teenagers the tantrums just come in different forms. Learning how to deal with them when they are toddlers, I think still works when they are teenagers, maybe.
I have found this wonderful post by Toddler Approved on ways to deal with these tantrums, I think all parents have to deal with them in some form and having different techniques always helps.
This post is definitely worth a read.
Read the full article at: http://www.toddlerapproved.com/2012/04/toddler-tantrums-ways-to-deal.html
If you are looking for a way to be consistent with your discipline EEK Toy shop have the perfect solution
The Portable Time Out Mat; follow the link for details.