GRID.FirstDataFrame

state = GRID.FirstDataFrame( BYVAL nControl    AS INTEGER,

                             BYVAL nFirstFrame AS INTEGER ) AS INTEGER

Set or get the first frame number of the data range.  This is used when only part of a file is being loaded

Example:

' First frame number of the loaded data

nFrame = 2

GRID.FirstDataFrame( nControl, nFrame )

' Get the row number for each of the frames

FOR i = 1 TO GRID.GetRange( nControl, MB_RANGE_DATA, MG_GET_ROWCOUNT )

  nRow = GRID.GetDataFrameRow( nControl, nFrame )

  nFrame = nFrame + 1

ENDFOR