A roof system includes a closure panel that opens a roof opening in which it is positioned partially above a portion of a roof. An operating mechanism includes a front device having a lever for moving the front edge of the panel in a vertical direction. The lever is pivotally connected to a driving slide that has a cam partly in engagement with a stationary guide curve and is in engagement with the panel through a pin-curve assembly. A curve of the pin-curve assembly has a guiding curve extending allowing a corresponding pin to slide along it to move the front of the panel at least in vertical direction when the lever is driven by the driving slide. A locking curve extends mainly vertically when a pin is positioned in the locking curve in order to allow the driving slide to slide the panel in longitudinal direction.