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xCombo with xGrid using setCellExcellType

I'm attempting to find out out to integrate the xCombo into a cell using setCellExcellType

When I call this line:
grdItems.setCellExcellType("1","1","combo");

I get this error: "Error 'undefined' is null or not an object"

I looked at a collection of pages including this one and it's related pages:
http://dhtmlx.com/docs/products/kb/index.shtml?cat=kb&q=5197&ssr=yes

That didnt help. This page shows a combo the way I want it (with the standard down arrow) in the header, I just want that in a cell.
http://www.dhtmlx.com/docs/products/dhtmlxGrid/index.shtml

We purchased the Grid and Combo, and I have double checked that the files are the current pro versions.

Thanks again,
James


The code is as follows:
grdItems = new dhtmlXGridObject('grdItems_Container');
grdItems.setHeader(",");
grdItems.setNoHeader(true);
grdItems.setImagePath("images/grid_images/");
grdItems.setInitWidths("80,160");
grdItems.setColAlign("left,left");
grdItems.init();

grdItems.addRow("1", "Side Dish 1,");
grdItems.addRow("2", "Side Dish 2,");

//grdItems.setCellExcellType("1","1","combo"); // <- error here.
grdItems.setCellExcellType("1","1","coro");
grdItems.setCellExcellType("2","1","coro");