When I double-click on a file to download it, an empty RadWindow appears. How to I either prevent this from appearing, or close if after the download begins/finishes?
If you take a look at this demo it shows how to force direct downloading - which should take care of the RadWindow problem. It would seem that this javascript is what handles everything when you have defined the onclientfileopen event.
function OnClientFileOpen(oExplorer, args)
{
var item = args.get_item();
args.set_cancel(true); //this prevents the window from opening
var docLoc = "Handler.ashx?path=" + item.get_url();
document.location = docLoc;
}
That function is just a re-write of the one provided in the demo with all of the checking removed. It will force a download as well so perhaps you just need to use the args.set_cancel(true); line depending on your implementation.