A man accused in a hit-and-run crash that seriously injured an 11-year-old Grafton boy is being held on a $500,000 cash bond.David Sitar was given the bond during his initial appearance at the Ozaukee County Courthouse in Port Washington on Wednesday afternoon. Sitar was arrested in Illinois Saturday night, but he waived extradition from Illinois, according to the Ozaukee County Sheriff's Office.WATCH: 'Not how you should live life': Injured Gra…