Hello Grincheux,
The grid columns and rows are numbered beginning with 0. So the first column is column 0 and first row is row 0.
SimpleGrid_SetItemTextAlignmentEx(hgrid, 0,0,GSA_RIGHT);
should set the contents of the first cell to a right alignment.
SimpleGrid_SetColWidth(hgrid,0,100);
should set the width of the first column to 100 pixels.
HTH
DMac