Menu/Toggle button question..

[bratsche dfw net]

I've got a toggle button that, when pressed, pops up a menu. When any of
the items on the menu are selected, they revert the toggle button to it's
depressed state. However, if the mouse is clicked outside the area of the
menu then the menu disappears and the toggle button remains in its pressed
state. I looked at gtkmenu.h and couldn't find any relevant signals. How
would I go about solving this problem?