LoadingAnimation control

It seems there is very little documentation on how to use the LoadingAnimation control.

I am trying to use sapUrMapi_LoadingAnimation_trigger() in the onLoad of the Body tag but it is not working.

I can manually write:

<script "javascr1pt-whatever">
sapUrMapi_LoadingAnimation_trigger();
</script>

And it works and plays the animation while the page is loading. However, it doesn't go away. Is there some way that I should implement sapUrMapi_LoadingAnimation_hide()? The sapUrMapi functions are completely undocumented.

Many thanks! --Shibli