I have been following this thread (http://www.telerik.com/forums/radasyncupload-clear-items-using-serverside-code) for a similar issue.
Issue: "I am using RadAsyncUpload to upload files. I have a 'Cancel' button which the user can click anytime after selecting the files. I want to clear the selected files - or in other words reset the RadAsyncUpload Control when 'Cancel' button is clicked." (by Liby George)
Solution: Please include the following line of code in your click handler for the "Cancel" button.
$telerik.$(".ruInputs li .ruRemove").click()
This will go through the files <li> elements and click on the "Remove" link. (by Boyan Dimitrov)
My problem: Since there are severals RadAsyncUpload along with coresponding buttons in one page, this will clear all selected files of all upload controls for a single click . How can I clear the items of one RadAsyncUpload without affecting the others?