>Why is this not working? THISFORM.Grid1.SetAll('BackColor',RGB(201,205,188),'Heater')

Like everyone said, it is spelled "Header". But that won't work anyways, since the header is in teh column, not the grid. Use this instead:

for each loColumn in grid.columns
	loColumn.Header1.BackColor = rgb(201, 205, 188)
endfor