This is not really a menu but a window instead, and it's also not what I want to write about. What really interested me was the effect of showing a single menu item at the right side of the menu bar. This is a very cool effect because you use the same toolbar button to both show and hide the menu list. Achieving this effect is actually quite easy: you must add an empty button on the left. Here's the script I used to mimic this effect:
I_IMAGENONE, ID_MENU_EMPTY, TBSTATE_ENABLED, TBSTYLE_AUTOSIZE,
IDS_EMPTY, 0, NOMENU,
I_IMAGENONE, ID_MENU_CANCEL, TBSTATE_ENABLED, TBSTYLE_AUTOSIZE,
ID_MENU_CANCEL, 0, NOMENU,
The IDS_EMPTY string resource contains one space character only and the ID_MENU_EMPTY command is not handled. This seems to be the same approach that HTC used when writing the user interface: if you click the left soft button or the left menu area, you will see the visual feedback just like it had a real button.