I'm new to Mac OS X Dashboard developement. Now, I have a button with id b\_start.
When that button is clicked, I want the label of the button to change to "Round".

Now I have tried these, but none of them work:

```
document.getElementById("b_start").label = "Round";
document.getElementById("b_start").text = "Round";
document.getElementById("b_start").innerText = "Round";
document.getElementById("b_start").object.setValue("Round");
document.getElementById("b_start").value = "Round";

```

Does anyone how I can change the button's label?