A sliding door panel and assembly is described, such that when in the door panel is in an open arrangement there is a functional cooperation or coupling between at least a first unit and a second unit of the assembly. The second unit is generally affixed to the sliding door and the first unit is fixedly mounted with a sliding door guide system or to a header/footer or frame. A third unit may be included with the assembly such that when the sliding door panel is positioned in the open arrangement, the third unit limits engagement between the first and second units. In addition, the third unit is positioned to limit linear movement of a slideable portion of the first unit thereby preventing damage.