change the “listitem” of a directory item at run time?

It would be possible to change the “listitem” of a given directory item, at run time?

I wanted to use an option from a custom context menu, to change the “setInfo” from the “ListItem”, of the “addDirectoryItem” function only on the item that received the right-click.

The context menu and the new “setinfo” I already have, I do not know how to change this at runtime!

Change it:

PHP Code:
liz xbmcgui.ListItem(nameiconImage='DefaultFolder.png'thumbnailImage=iconimage)
xbmcplugin.addDirectoryItem(handle=int(sys.argv[1]), url=ulistitem=lizisFolder=pastatotalItems=total

for this, at run time:

PHP Code:
liz xbmcgui.ListItem(nameiconImage='DefaultFolder.png'thumbnailImage=iconimage)
liz.setInfo(type="Video"infoLabels={'Genre' 'Comedy'})
xbmcplugin.addDirectoryItem(handle=int(sys.argv[1]), url=ulistitem=lizisFolder=pastatotalItems=total