you can use the following code in the ONMANIPULATION event to modify the color of the row. but be aware that if SAP changes rendering ot htmlb:tableview it may not work.
this code sample set the bgcolor of row 2 to blue.
DATA: httpbody TYPE string .
CALL METHOD response->if_http_entity~get_cdata
RECEIVING
data = httpbody.
REPLACE ALL OCCURRENCES OF '<tr rr="2"' IN httpbody WITH '<tr rr="2" bgcolor="blue"' IGNORING CASE .
CALL METHOD response->if_http_entity~set_cdata
EXPORTING
data = httpbody.
Regards
Raja
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