The SFR responder classes whose names start with "SFR" are not currently supported and will be discontinued in SophiaFramework UNIVERSE 6.0.

In the development of a new GUI applet, it is recommended to use the SFY responder classes whose names start with "SFY" or "SFZ"

Reference: Development with SFY GUI Framework | SFY Responder | SFR Responder