Register of wills. There shall be a Register of Wills in each county of the State, and the City of Baltimore, to be elected by the legal and qualified voters of said counties and city, respectively, who shall hold his office for four years from the time of his election and until his successor is elected and qualified; he shall be re-eligible, and subject at all times to removal for willful neglect of duty, or misdemeanor in office in the same manner that the Clerks of the Courts are removable. In the event of any vacancy in the office of the Register of Wills, said vacancy shall be filled by the Judges of the Orphans' Court, in which such vacancy occurs, until the next general election for Delegates to the General Assembly when a Register shall be elected to serve for four years thereafter.