setting dgrid allowSelectAll to true is not working - dojo

Question

I have an empty grid, with the columns defined as below:
var json = { };
json.col1 = { label: 'Select', selector: 'checkbox' };
json.bndryName = "Boundary Name";
return json;
The boundary grid is initialized as below and the data/collection is loaded on a button click,and when I set allowSelectAll:true, I donot see the the header column rendered with a checkbox to select All. Please advise.
this._bndryGrid = new (declare([OnDemandGrid, Selection,Selector,ColumnResizer]))({
selectionMode: "multiple",
columns: columns,
class:'grid',
loadingMessage: "Loading data...",
noDataMessage: "No results found."
}, this.ap);

Answer 1

I'm not sure you've provided enough to go on here (and your grid doesn't even include allowSelectAll: true), but here is an example that works:
require({
packages: [
{
name: 'dgrid',
location: '//cdn.rawgit.com/SitePen/dgrid/v1.0.0'
},
{
name: 'dstore',
location: '//cdn.rawgit.com/SitePen/dstore/v1.1.1'
}
]
}, [
'dojo/_base/declare',
'dgrid/OnDemandGrid',
'dgrid/Selection',
'dgrid/Selector',
'dstore/Memory',
'dojo/domReady!'
], function(declare, OnDemandGrid, Selection, Selector, Memory) {
var data = [
{ id: 1, name: 'Peter' },
{ id: 2, name: 'Paul' },
{ id: 3, name: 'Mary' }
];
var store = new Memory({ data: data });
var options = {
allowSelectAll: true,
collection: store,
columns: [
{ field: 'id', label: '', selector: 'checkbox' },
{ field: 'name', label: 'Name' }
]
};
new (declare([ OnDemandGrid, Selection, Selector ]))(options, 'gridcontainer');
});