save as link doesn't save the file at mentioned destination in the filedialog! 
i have fixed the problem...and now its working. before it was not possible for me to save the attachment anywhere using "save as" link...while i was trying ui test cases!

if you look in the code i have just done this :

string filedestinationpath = filedialog.open();
			filedialog.settext("save as...");
			if (!filedestinationpath.equals("")) {
				copyfile(filedestinationpath);
			}

in the file: mefilechoosercontrol