I need a way to set GtkEntry::button

Or rather, I need a way to reset a GtkEntry to its normal state when
it is not going to get the button-release event it is waiting for.
That, in turn, happens when a focus-in handler throws up a dialog.

Code from Gnumeric:

static gboolean
cb_editline_focus_in (GtkWidget *w, GdkEventFocus *event,
		      WBCGtk *wbcg)
{
	if (!wbcg_is_editing (wbcg))
		if (!wbcg_edit_start (wbcg, FALSE, TRUE)) {
			GtkEntry *entry = GTK_ENTRY (w);
			wbcg_focus_cur_scg (wbcg);
			entry->in_drag = FALSE;
			/*
			 * ->button is private, ugh.  Since the text area
			 * never gets a release event, there seems to be
			 * no official way of returning the widget to its
			 * correct state.
			 */
			entry->button = 0;
			return TRUE;
		}

	return FALSE;
}