[gtkmm] Which event is it?

[erik_ohrnberger dme net]

	I need to receive an event from a combo when the user clicks into
the text entry part of the combo.

	I've looked at the events that are listed in the documentation, but
I'm not sure which one to override.

	Could you help me out and tell me which event it is that I need to
override?

	Thanks,
		Erik.