ECMS-5902 "Show Drives" button and some menu did not work after selecting the folders

Problem analysis:
* ZeroClipboard flash is not destroyed when item [Copy URL To ClipBoard] disappears

Fix description:
* Destroy ZeroClipboard flash when item [Copy URL To ClipBoard] disappears
Merge commit '32402f573bc45cdbcf2d71a78d0ca600d0948ef7' into HEAD