Check/uncheck kogrid checkbox based on an observable

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HTML

Knockout.js

I am using kogrid where i thought of using the default checkbox and check/uncheck it based on a value from the list that is being bound to it. And also when i check/uncheck this checkbox, it should update the selectedItems property appropriately. I checked cellTemplate. But I am unable to identify how to use it.


<pre lang="HTML">
    <div style="height: 650px; width: 99%;" data-bind="koGrid: { data: allList,displaySelectionCheckbox: true, multiSelect :true, selectWithCheckboxOnly: true,  selectedItems: selectedList ,
                    footerVisible : false, disableTextSelection: false,
                    afterSelectionChange: function (rowItem) { return true; },

        columnDefs: [{ field: 'Name', displayName: 'Name', width: '20%' ,headerTemplate: 'koHeader'  },

                    { field: 'Country', displayName: 'Country', width: '20%' ,headerTemplate: 'koHeader' },
                    { field: 'DOB', displayName: 'DOB', width: '20%' ,headerTemplate: 'koHeader' },
                    { field: 'Profession', displayName: 'Profession', width: '20%' ,headerTemplate: 'koHeader' },

                    {field: 'IsToBeChecked', displayName: 'Selection', width: '30%',  headerClass: 'koHeader'},


        ]
        }">
    </div>

From the above html code, IsToBeChecked is the column based on which the 'displaySelectionCheckbox' should be checked or unchecked.

Could some one suggest me how check/uncheck the default checkbox based on a value?