How do you stop a 4 yr old from peeing in his pants?

FIRST YOU SHOULD SIT DOWN AND TALK TO HIM ABOUT IT AND MAYBE BUY HIM UNDERWEAR WITH HIS FAVORITE CHARECTERS ON IT. MAYBE IF YOU SHOW HIM HOW ITS DONE BUY BRINGING HIM INTO THE BATHROOM WITH YOU AND SHOWING HIM HOW TO PEE FIRST YOU SHOULD SIT DOWN AND TALK TO HIM ABOUT IT AND MAYBE BUY HIM UNDERWEAR WITH HIS FAVORITE CHARECTERS ON IT. MAYBE IF YOU SHOW HIM HOW ITS DONE BUY BRINGING HIM INTO THE BATHROOM WITH YOU AND SHOWING HIM HOW TO PEE