[Openbox] Cannot select a menu item with keyboard ?

[papa.eric at free.fr]

Hi openbox helpers,

After trying Openbox I liked it so began to configure it (on Arch Linux).

My very first move was to bind a key (W-Tab) to the list of applications (same as middle mouse button on root window), to be able to switch app with the keyboeard (W-Tab, arrows, then return).

... and the only way to choose a menu item seems to mouse click it !!! sad  is it possible to activate the selection with the return key ?

Thanks for any help.