[Gtk-sharp-list] Emiting a FocusGrabbed signal in Mono

[Matt234]

I'm writing a composite widget and I would like it to send the FocusGrabbed
event when the Entry it contains grabs the focus. However, I can't simply
do:

if (FocusGrabbed != null) FocusGrabbed (this, new EventHandler ())

because I get a compiler error telling me that the event can only be on the
left side of += or -=. Then I tried:

Glib.Signal.Emit (this, "focus-in-event");

but it does nothing but giving me a warning in the console: 
GLib-GObject-CRITICAL **: g_value_set_boolean: assertion
`G_VALUE_HOLDS_BOOLEAN (value)' failed
GLib-GObject-CRITICAL **: g_value_unset: assertion `G_IS_VALUE (value)'
failed

What am I doing wrong? Thanks :)
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