We are responsible for how are children act. It all starts in the home!!! I hear to many times I can not control my child. Every child will be tempermental at times but this is where we need to do some soul searching and realize we as parents need to set the example and TEACH our child the acceptable ways of behaving.  
I also use 1-2-3-magic with many other methods. There are looks, tone of voice, sign language. I have a niece and nephew I am casaring for. A 4 year old and a 2 year old. There are many behavioral problems with the 4 year old. 9 months ago he could not stay on task to even eat dinner. Today he is learning to write his name and is enjoying life. Without going to into detail this child was a nightmare. He is involved with many agencies because of his behaviors. He attended headstart last year only to get kicked out because of his disruptive behaviors! Over the summer break I went full force into behavior modification and well we are now working on impulse control. He was the ruler of his home for 4 years. It will take a long time but I have faith that we will begin kindergarden without delay.  
Some of the things I had to do was take all toys away from him. He learned very fast that I meant what i said. If he was to throw a tey he lost it. If he destroyed a toy well he had to do work outside to pay for that toy. Maybe it sounds mean to some people but where is any child going to learn what the value of a dollar is? FROM THE PARENTS. My husband and I work very hard in order provide for our family. I feel that children get a free ride in this society. They need to learn to earn a dollar. We as parents encourage a paper route and mowing grass for our 12 year old. She enjoys it and always has money! 
A note on sign language, you do not need to be an expert (I know about 25 signs). My two year old niece was very delayed in speech. We started speaking and signing for simple words like food, drink, more, and puppy. After 6 months she improved from being 25% behind to 25% above! She loves to sign when she speaks. If you do not pay attention to her she will go by our oven and sign hot (for the praise of course).