GtkItemFactoryEntry shortcut keys

[Daniel Pekelharing <legendstar gmail com>]

Hi all,

This is my first post - I'm fairly new to gtk programming.
I program in C, here's my problem.

I'm building a main menu for my app using GtkItemFactory,
I'm trying to assign the '=' key as a shortcut on one of the items like this:

{"/Edit/Frame Sequence Shift/Increment/1 Frame", "=",
main_menu_action, 620, "<Item>", NULL},

It doesn't seem to get recognized as there is no shortcut in the
graphical menu and nothing happens when the key is pressed.
Am I defining it incorrectly?
Other shortcut key's work perfect like this one:

{"/Edit/Object/Shift on X-Axis", "5", main_menu_action, 300, "<Item>", NULL},

Thanks