[flexcoders] How to call page down function in Flex DataGrid

[umd.wang]

I have a DataGrid control in Flash Builder, it shows a long list of data. I 
want to set a timer, so every time the timer ticks, it will call a function 
which makes the DataGrid control do a pagedown action, just like you click the 
scroll bar every 3 seconds. What is the easiest way?

Thanks.