(Gresham, OR)  --  Police in Gresham are searching for a missing three-year-old boy believed to be with his non-custodial mother.  Police say Rosalie Dunlap took her son Zayden Dunlap last night.  Dunlap is only allowed to have supervised visits with her son.  She's believed to be driving a black Kia Rio with the license plate ZTM365.