Use this method if you need to verify the selection of multiple data-grid cells. Verify() does not correctly handle mulitple data-grid cells.
If a timeout is specified with the nTimeout parameter, Silk Test Classic calls VerifyMultiSelCol() until the condition is verified or the timeout is reached. The time between checks is the value of the window retry interval Agent option, OPT_WINDOW_RETRY. If the verification fails, an exception is thrown.