Hi Michael, the latest test release 5.11.3 includes a decoder definition file for Hornby TXS (HM7000) decoders. It has been tested for the decoders I have and is based on the latest Hornby manual.
If you don't want to update to the test version you could add the Hornby.TXS file into your decoder definitions, but without an update to the java, included in 5.11.3, DecoderPro won't automatically detect the correct decoder definition, you will need to select it manually.
Peter