Populating data in a dropdown or combo box from webService

I have created a webService by dragging and dropping in the canvas.
The output of the service is a document list.
I want to populate the values of this in a drop down or combo box.
Can you please help me to create it.

Put the drop down control on the canvas
Bind the value of the drop down to a results provider bean for the web service output
Set the service autorefresh property to true so that the list is populated without having to click a command button