Test file

app.js

// this sets the background color of the master UIView (when there are no windows/tab groups on it)
Titanium.UI.setBackgroundColor('#000');


// create base UI tab and root window
//
var win1 = Titanium.UI.createWindow({  
    title:'Tab 1',
    backgroundColor:'#fff'
});
var data = [];
var item = Titanium.UI.createDashboardItem({
			image:'Apple.png',
			selectedImage:'Apple.png',
			label:'test'
		});
data.push(item);
data.push(item);
data.push(item);
data.push(item);
data.push(item);
data.push(item);
data.push(item);
data.push(item);
data.push(item);
data.push(item);
data.push(item);
data.push(item);


var dashboard = Titanium.UI.createDashboardView({
	data:data
});
win1.add(dashboard);
win1.open();

Suggestion: Use a for loop so that all the items in data are unique instead of the same one over and over.