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WEBENCH® Tools/LM5002: Will WEBENCH support negative input/positive output converters?

Part Number: LM5002

Tool/software: WEBENCH® Design Tools

I have selected the LM5002 for a telecom power conversion design.  The input will be -8V to -48V and the output will be +5.0V, 100mA.  I am using a current mirror circuit to provide the voltage feedback signal to the LM5002.  I have attempted to use WEBENCH to provide a design that I can cross check with my own.  Either I am incorrectly entering the input parameters, or the WEBENCH tool will not do this type of design.  If anyone else has been successful in using WEBENCH for a negative input/positive output converter, I'd like to hear how you succeeded.