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There are two possible solutions:

1) the column type is coro, the options are defined for the column:

var combo = grid.getCombo(index)

combo.put(key1,value1);

..

combo.put(keyN,valuen);

But 8 from 10 rows have another type:

<cell type="ro">...</cell>

Or you can use setCellExcellType method to define cell type.

2) column type isn't coro, but  2 cells in this column have coro type:

<cell type="coro" xmlcontent="1">1<option value="1">some text here</option><option value="2">...</option></cell>

var combo = grid.getCustomCombo(rowId,columnIndex);

combo.put(key,value);

I am doing the following and it is not working:

grid.setCellExcellType(rowId, 10, "coro");
         var c = grid.getCustomCombo(rowId, 10);        
         c.put("A", 1);
         c.put("B", 2);
         c.put("C", 3);
         c.put("D", 4);

Is there something else I need to be doing?

Thanks in advance.

The provided code looks correct. It should be called when row is loaded/added. In case of xml loading:

grid.loadXML(url,function(){

  grid.setCellExcellType(rowId, 10, "coro");
  var c = grid.getCustomCombo(rowId, 10);  
  c.put("A", 1);
  c.put("B", 2);
  c.put("C", 3);
  c.put("D", 4);

})

To change cell value you can use setValue method:

grid.cells(rowId, 10).setValue("A");

I am doing just that, I think, and it's not working.  I am not seeing the combo box that is defined in the grid:

grid.load(myUrl, function () {        

myGrid.setCellExcellType(rowId, 10, "coro");
         var c = myGrid.getCustomCombo(rowId, 10);        
         c.put("A", 1);
         c.put("B", 2);
         c.put("C", 3);
         c.put("D", 4);

}

Drop-down appears only in editing mode. When cell isn;t edited, you see cell value. 

Please provide complete sample to recreate the problem if the editor type  isn't set.