A refrigerator shelf, comprising: a frame including laterally spaced first and second side members (16, 18), each defining opposite first and second ends (20, 22), the first ends of the first and second side members (16, 18) defining side portions of a front edge profile of the refrigerator shelf, and a medial member extending between the first and second side members (16, 18) at respective locations between the first and second ends (20, 22) of the first and second side members (16, 18), respectively; a first substrate received between the first and second side members (16, 18), defining a first edge, and moveable along the first and second side members (16, 18) between an extended position with the first edge adjacent to the first ends of the first and second side members (16, 18) and a tucked position with the front edge spaced away from the first ends; and a trim member extending along the first edge of the first substrate and defining a third portion of the front edge profile that is aligned with the side portions when the first substrate is in the extended position, characterized in that the trim member physically engages with the side portions when the first substrate is in the extended position, wherein for most of the range of placement of the first substrate in the extended position, the initial upward movement of the trim member will force the first substrate rearward due to physically engaging to side portions of the front edge profile that extend upward at acute angles, to bring it into contact with medial member, thereby providing additional resistance to prevent inadvertent upward movement of trim member. a frame including laterally spaced first and second side members (16, 18), each defining opposite first and second ends (20, 22), the first ends of the first and second side members (16, 18) defining side portions of a front edge profile of the refrigerator shelf, and a medial member extending between the first and second side members (16, 18) at respective locations between the first and second ends (20, 22) of the first and second side members (16, 18), respectively; a first substrate received between the first and second side members (16, 18), defining a first edge, and moveable along the first and second side members (16, 18) between an extended position with the first edge adjacent to the first ends of the first and second side members (16, 18) and a tucked position with the front edge spaced away from the first ends; and a trim member extending along the first edge of the first substrate and defining a third portion of the front edge profile that is aligned with the side portions when the first substrate is in the extended position, characterized in that the trim member physically engages with the side portions when the first substrate is in the extended position, wherein for most of the range of placement of the first substrate in the extended position, the initial upward movement of the trim member will force the first substrate rearward due to physically engaging to side portions of the front edge profile that extend upward at acute angles, to bring it into contact with medial member, thereby providing additional resistance to prevent inadvertent upward movement of trim member.