(a) Requirement. Except as provided in Rule 90.1 only members of the Bar of the Supreme Court of this State currently entitled to practice in that Court who maintain an office in Delaware for the practice of law shall be entitled to practice as an attorney in this Court.(b) Withdrawal. Except as permitted by order of the Court, no attorney may withdraw and all appearing attorneys are required to continue as such and to perform the duties of counsel imposed by law, by the Delaware Lawyer's Rules of Professional Conduct, and the Rules of this Court. Withdrawal of an attorney ordinarily will not be considered as permissible ground for delay and relief under these Rules.(c) Agreements between attorneys. Agreements between attorneys will not be considered by the Court unless they are in writing and filed with the Clerk or stated on the record in the presence of the Court.