(Cedar Mill, OR)  --  A 16-year-old Washington County boy is being sought after he was reported missing.  Sheriff's deputies say Alexander Selchow [[ SELL-ko ]] was last seen yesterday afternoon in the Cedar Mill area.  Alexander is said to have the aptitude of a ten-year-old, and is reportedly familiar with public transportation.  He was last known to be wearing a black sweatshirt and dark pants.