Dashboards are the backdrops on which all controls and charts are bundled together. Since they act as the unifying component of the visualization and controls, dashboards can also be intentionally linked to create dependencies between controls. Controls may also be used to set a visualization to a predefined state, or act as a trigger point for ChartWrapper events.
In general, a visualization with dashboard, controls, and events will always follow a pattern similar to the following outline:
<html>
<head>
<script>
function visualization{
// Listen for an error event to happen
google.visualization.events.addListener(chart/dashboard, 'error/ready/select',run_on_error);
// Load the Wrapper libraries
google.load
// Data creation, linking methods don't change
var data = google.visualization.DataTable
// Create some controls
var ctrl = new google.visualization.ControlWrapper
// Create a chart
var chart = new google.visualization.ChartWrapper
// Bundle controls...