Disregard - I figured it out. It took a bit more code than I anticipated. Here's an example from one of the data entry cells:
//data entry cell
if (FY10.rawValue<0) then FY10.font.fill.color.value="255,0,0"
else FY10.font.fill.color.value="0,0,0"
endif
//row total
if (form1.Table1.Row1.FYDP.rawValue<0) then FYDP.font.fill.color.value="255,0,0"
else FYDP.font.fill.color.value="0,0,0"
endif
//column total
if (form1.Table1.FooterRow.tFY10.rawValue<0) then form1.Table1.FooterRow.tFY10.font.fill.color.value="255,0,0"
else form1.Table1.FooterRow.tFY10.font.fill.color.value="0,0,0"
endif
//table total
if (form1.Table1.FooterRow.tFYDP.rawValue<0) then form1.Table1.FooterRow.tFYDP.font.fill.color.value="255,0,0"
else form1.Table1.FooterRow.tFYDP.font.fill.color.value="0,0,0"
endif