Disabling kendo datepicker when clicked on checkbox

Here's a slightly different approach:

$(document).ready(function() {
    $("#RequredFilter").change(function() {
        $('#DateFrom').data('kendoDatePicker').enable(this.checked);
        $('#DateTo').data('kendoDatePicker').enable(this.checked);
    });
});

There is special method for enabling/disabling the DatePicker called enable - check this demo.

$('#RequredFilter').click(function(e){
    if($(this).is(':checked')){
        $('#DateFrom').data('kendoDatePicker').enable(true);
        $('#DateTo').data('kendoDatePicker').enable(true);
    }
    else{
        $('#DateFrom').data('kendoDatePicker').enable(false);
        $('#DateTo').data('kendoDatePicker').enable(false);
    }
})