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I would recommend using a different method to implement a run-once step. One way would be to add a build rule something like
%HAS_RUN% is undefined
to the first step, and in the step's vbld_StepDone event, create the global macro HAS_RUN:
Application.Macros(vbldMacroGlobal).Add "HAS_RUN", ""
(see attached sample). This avoids modifying the .bld file and the behavior is more obvious.
As far as refreshing the GUI, use this VBScript code in a Run Script step:
CreateObject("WScript.Shell").SendKeys "{F5}", True
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