I too am very interested in this. I know you can use RowNumber("matrix_RowGroup") to get it when the matrix receives data for every cell in the grid. However when the matrix doesn't receive any data and must generate a blank cell it appears to not increment the RowNumber count. From http://www.developmentnow.com/g/115_2005_3_0_0_456397/Matrix-Column-Index.htm Posted via DevelopmentNow.com Groups http://www.developmentnow.com/g/