A window assembly for sealingly attaching a window glass to a frame of a motor vehicle door is disclosed. The window assembly includes a sealing assembly in combination with a window glass. The sealing assembly comprises a sealing, trimming or guiding strip comprising a length of extruded material, a polypropylene or the like part which is joined to the window glass at an edge of the window glass, and a molded material, which is joined to the polypropylene or the like part and connected to said sealing strip. The molded material is preferably made of TPE. The strip is preferably made of EPDM. The molded material is molded in a mold with the polypropylene or the like part, which has previously been molded onto the window glass, and the strip to mold onto and thereby connect to these parts.