Abstract: A movement restricting device to be used with a panel member engaging portion slidably mounted on an elongated member, the engaging portion constructed and arranged to be fixedly engaged with a panel member so as to attach the elongated member to the panel member. The movement restricting device comprises a movement restricting portion having a pair of elongated member securing portions. The securing portions are flexible and are disposed to be biased into inwardly gripping engagement with the elongated member such that relative longitudinal movement of said movement restricting portion along the elongated member is substantially prevented. The securing portions have respective longitudinal movement limiting surfaces positioned and configured to restrict sliding longitudinal movement of the panel member engaging portion to a range therebetween.