rabilon: You have three choices.
(1) Use these applications in LXDE or
(2) open the Debian Chroot and use "wmctrl -l" to list the available windows and then "wmctrl -a <windowname>" to restore the lost window (you only have to use the list once, after that, once you know the window name, you can make a command in Personal Menu to run as root: "debian wmctrl -a <window name>") or
(3) use kciconsbox to find and restore your lost windows. This is a GUI frontend for wmctrl.