Busy indicator for WCF async calls in Silverlight 4?

I have a SL4 app consuming WCF services. The client make async call to the services, during this time I would like to show some sort information or busy indicator on the screen which tells the users that the app is doing something开发者_C百科.

Now I am pretty sure SL4 has something like this, but I am drawing a blank....

Can someone please point me to the right direction?

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Maybe you are looking for the BusyIndicator control which is part of the Silverlight Toolkit Experimental quality band.

You can try the control on the following link:

http://www.silverlight.net/content/samples/sl4/toolkitcontrolsamples/run/default.html

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You need an animation storyboard and then use code like this:

wcfProxyClass.DoMethodAsync()
loadingStoryboard.Begin();

Then in the Completed event handler

loadingStoryboard.End(); // not sure on this syntax

Here's a great article that should get you started. -- http://chrisa.wordpress.com/2008/10/09/a-wait-indicator-in-silverlight/