Selector not being checked in IE

I've got a grid with the selection mode set to multi-row-marker. Everything works fine in Firefox, but in IE, when I click on a row, the row gets highlighted but the selector checkbox never gets checked off.

Here's my code:

allRows = Array();
assetList = Array();

// create grid object
objGrid = new AW.UI.Grid;
objGrid.setId("list_grid");

// assign cells and headers text
objGrid.setCellText(my_data);
objGrid.setHeaderText(my_headers);

objGrid.setColumnCount(6);
objGrid.setRowCount(total);

objGrid.setColumnWidth(175, 0);
objGrid.setColumnWidth(75, 1);
objGrid.setColumnWidth(75, 2);
objGrid.setColumnWidth(100, 3);
objGrid.setColumnWidth(75, 4);

objGrid.setSelectionMode("multi-row-marker");

objGrid.setStyle("width", objContent.offsetWidth - 10);
objGrid.setStyle("height", objContent.offsetHeight - 70);
objGrid.setStyle("border", "1px solid #c0c0c0");

objList = document.getElementById('list_table');

if(objList)
{
    objList.innerHTML = objGrid;
}
  '
Any ideas what might be the issue?

Thanks,
Jason

Using version 2.0.0, btw.