After a little research into the problem... I notice the following things.

 

After selecting the file to upload..   CuteWebUi:Uploader  calls a partial page request and on page load is called.

 

However, after the progress bar reaches 100% and the file name shows a green check next to it.. It's seems the CuteWebUI:uploader onfileuploaded and onuploadedcompleted events are generated.  After  these events are execute is where the complete page post back occurrs.

 

Any Help would be great..