Tmux linux keybindings like S-C-E not working

Question

I am trying to create S-C-E shortcut in my ~/.tmux.conf

I have succeeded with staff like:

bind -n ^e split-window -h
bind -n C-e split-window -h

#

But none of the following seems to work:

bind -n S-C-e split-window -h
bind -n S-C-E split-window -h
bind -n S-^e split-window -h
bind -n S-^E split-window -h
bind -n S^e split-window -h
bind -n S^E split-window -h

#

Surprisingly even this works:

bind -n S-C-Left split-window -h
bind -n S-C-Right split-window -h

#

But this doesn't: :(

bind -n S-C-Up split-window -h
bind -n S-C-Down split-window -h

#

How can I create S-C-#character-like shortcut in tmux?

I am using:
tmux 2.0
xfce4-terminal 0.6.2 (Xfce 4.10)
Debian GNU/Linux 7.8 (wheezy)

Answer 1

First make sure that those keybindings are not captured by your desktop environment. Look into xfce4-keyboard-settings and xfwm4-settings for a list of shortcuts.