JSFiddle - React, Tailwind, and code Playground

HTML

<div id="budget-list-container" class="well sidebar-nav">
        <ul class="nav nav-list" data-bind="template: { name: 'budgetTemplate', foreach: budgets, as: 'budget' }">
            <script type="text/html" id="budgetTemplate">
                <li class="nav-header">
                    Paycheck for <span data-bind="text: PaycheckBudgetDate"></span> - <span data-bind="text: PaycheckBudgetAmount"></span>
                </li>
                <li>
                    <table class="table table-bordered table-condensed">
                        <thead>
                            <tr>
                                <th>Description</th>
                                <th>Amount</th>
                                <th>Due Date</th>
                                <th>Paid/Unpaid</th>
                            </tr>
                        </thead>
                        <tbody data-bind="template: { name: 'budgetItemTemplate', foreach: Items, as: 'budgetItem' }"></tbody>
                    </table>
                        Remaining: <span data-bind="text: Remaining"></span>
                    <hr />
                </li>
            </script>
            <script type="text/html" id="budgetItemTemplate">
                <tr>
                    <td><span data-bind="text: Description"></span></td>
                    <td><span data-bind="text: Amount"></span></td>
                    <td><span data-bind="text: DueDate"></span></td>
                    <td>
                        <button class="btn-link pull-right update-status" data-bind="text: IsPaid, click: updateStatus" />
                    </td>
                </tr>
            </script>
        </ul>
    </div>

JavaScript

var PaycheckBudgetItem = function(data) {
    var self = this;
    self.PaycheckBudgetItemId = ko.observable(data.PaycheckBudgetItemId);
    self.PaycheckBudgetId = ko.observable(data.PaycheckBudgetId);
    self.Description = ko.observable(data.Description);
    self.Amount = ko.observable(data.Amount);
    self.DueDate = ko.observable(data.DueDate);
    self.IsPaid = ko.observable(data.IsPaid);
    self.PaidStatus = ko.observable(data.PaidStatus);

    self.updateStatus = function() {
        alert('test');
    };
};

var mapping = {
    'Items': {
        create: function(options) {
            return new PaycheckBudgetItem(options.data);
        }
    }
};

var PaycheckBudget = function(data) {
    var self = this;
    self.PaycheckBudgetId = ko.observable(data.PaycheckBudgetId);
    self.PaycheckBudgetDate = ko.observable(data.PaycheckBudgetDate);
    self.PaycheckBudgetAmount = ko.observable(data.PaycheckBudgetAmount);
    self.Remaining = ko.observable(data.Remaining);
    //self.Items = ko.observableArray(data.Items);
    //ko.mapping.fromJSON(data.Items, mapping, self.Items);
    self.Items = ko.observableArray(ko.utils.arrayMap(data.Items, function(item){ 
console.log(item);
        return new PaycheckBudgetItem(item); 
    }));
};

var BudgetListViewModel = function(data) {
    var self = this;
    self.budgets = ko.observableArray(ko.utils.arrayMap(data, function(item){
        return new PaycheckBudget(item);
    }));
};

var data = [
    {
    "PaycheckBudgetId": 1,
    "PaycheckBudgetDate": "11/9/2012",
    "PaycheckBudgetAmount": 2315,
    "Items": [
        {
        "PaycheckBudgetItemId": 11,
        "PaycheckBudgetId": 1,
        "Description": "Rent",
        "Amount": 400,
        "DueDate": "11/9/2012",
        "IsPaid": "Unpaid",
        "PaidStatus": false},
    {
        "PaycheckBudgetItemId": 12,
        "PaycheckBudgetId": 1,
        "Description": "Cell Phone",
        "Amount": 166,
        "DueDate": "11/9/2012",
        "IsPaid":...