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When a column has its IsRowChecker property set to True, a few other properties will be automatically configured such as Width to 25px, ColumnType to Checkbox, SelectColumns To No and so on. The "select/deselect all" checkbox in Caption is automatically generated for IsRowChecker column. The code for the select/deselect all functionality has also been written internally.

Since the column type of Row checker column is checkbox, Caption property won't take effect when set. However, you can use the "hack" technique to the row checker element to add label element, such as shown in the following JS function.

function SetColumnCaption()
{
    var grid = ISGetObject("WebGrid1");
    var rowCheckerElm = grid.RootTable.GetElement(WG40.COLHEADER, WG40.HTMLTABLE).cells[1].childNodes[0].childNodes[0].childNodes[0];

    var newLabel = document.createElement("label");
    var newContent = document.createTextNode("this is text node");
    newLabel.appendChild(newContent);

    grid.RootTable.GetElement(WG40.COLHEADER, WG40.HTMLTABLE).cells[1].childNodes[0].childNodes[0].appendChild(newLabel);

    return true;
}

Hope this help.