I'm trying to use the igGridUpdating addRow method, but it silently fails.

Here's my code:

$('#DocumentPrintOrderGrid').igGridUpdating("addRow", {'Fk_tdoc_title' : 'word up!'});

Here's my grid definition:

$(function () {
$('#DocumentPrintOrderGrid').igGrid({
dataSource: '_DocumentsPrintOrder_Grid',
autoGenerateColumns: false,
autoGenerateLayouts: false,
responseDataKey: 'Records',
generateCompactJSONResponse: false,
columns: [{
headerText: '<span style=\'text-align: left; display:block;\'>Document Print Order<span>',
key: 'Fk_tdoc_title',
width: '100px',
hidden: false,
dataType: 'string',
formatter: null,
template: '<span style=\'text-align: left; display:block;\'>${Fk_tdoc_title}</span>'
}],
features: [{
sortUrlKey: 'sort',
sortUrlKeyAscValue: 'asc',
sortUrlKeyDescValue: 'desc',
name: 'Sorting',
mode: 'single',
type: 'local'
}, {
name: 'Selection',
mode: 'row',
multipleSelection: false
}, {
name: 'Resizing'
}, {
name: 'Selection',
multipleSelection: true,
mode: 'row'
}],
jQueryTemplating: false,
autoAdjustHeight: false,
width: '100%',
initialDataBindDepth: 0,
renderCheckboxes: true,
localSchemaTransform: false
});
});
selectionList - DocumentPrintOrder ');