FVWM: Fwd: My key shortcuts doesn't work

[for.register for.register]

I am a newbie on fvwm, I want to start xterm by press Alt+T, and I
added "Key t A MC Exec exec xterm" to the config, but helpless.
Thanks for any advice.

Here is my config:
#####
# Set Environment variables
 ###########
SetEnv fvwm_img $[FVWM_USERDIR]/images
SetEnv fvwm_icon $[FVWM_USERDIR]/icons
SetEnv fvwm_scrpt $./scripts
SetEnv fvwm_wallpapers $[FVWM_USERDIR]/backgrounds

#####
# Startup Functions
 ###########
DestroyFunc StartFunction
AddToFunc StartFunction
        + I Module FvwmPager 1 2
        + I Module FvwmButtons
        + I Exec exec xterm
        + I Exec exec fcitx -d

DestroyFunc InitFunction
 AddToFunc InitFunction
        + I Exec exec xscreensaver
        + I Exec exec fvwm-root -r $[fvwm_wallpapers]/wallpaper4.png
        + I Module FvwmAuto 100

DestroyFunc RestartFunction
AddToFunc RestartFunction
         + I Nop
#####
# RootMenu
###########
DestroyMenu FvwmRootMenu
AddToMenu   FvwmRootMenu "I Love Lailai!" Title
        + "Xterm%menu/terminal.png%" Exec exec xterm
        + "Firefox%menu/terminal.png%" Exec exec firefox
         + "" Nop
        + "Help%menu/help.png%"  Popup FvwmManPagesMenu
        + "Restart FVWM%menu/restart.png%"  Restart
        + "Quit FVWM%menu/quit.png%"  Quit

 #####
# Key and Mouse bindings
###########
Mouse 3 R A Menu FvwmRootMenu
Key t A MC Exec exec xterm