It would be nice if you could use a button bound to a navigation function to open URLs outside of ThingWorx. I was asked to add a button to one of our applications that would open a webpage in another one of our systems. The only option I had was to hide a link widget in the mashup and bind the clicked event from a button to the link. To my surprise, ThingWorx does not recognize the JavaScript window object, so you can't create a thing with a service to open a window or create an expression function that executes window.open(). That leaves you with two options for workarounds: using a link widget directly and styling it with CSS to look like a button or hiding a link widget and binding it to a button.
