How to make .fetch() return data every time it's called, not just the first time

[CDK]

As per the documentation on .fetch():

"The fetch method makes a request to the remote service only the first time it is called"

Why???

 

If a RadGrid is client bound to RadClientDataSource,  I can call .rebind() on the grid and it will call the Select webservice again,   so there must be a way to "reset" something so that .fetch() will call the webservice every time it's called?

[CDK]

I was able to get the .fetch to fire by first blanking out the data by calling .set_data([]);

 

var client = $find("<%=RadClientDataSource1.ClientID%>");
client.set_data([]);
client.fetch();