Frame shadow types

[Glus Xof <gtglus gmail com>]

Hi Guys,

The attached sample programm left all four frames with the same type
as "Shadow In"... What's wrong ?

(Gtkmm release 3.1.18)

#include <gtkmm.h>

int main (int argc, char *argv[])
{
	Gtk::Main FramesApp (argc, argv);
	
	Gtk::Window FramesWindow;
	FramesWindow.set_title ("Frames Window");
	FramesWindow.set_position (Gtk::WIN_POS_CENTER);
	FramesWindow.set_default_size (250, 250);
	FramesWindow.set_border_width (10);
	
	Gtk::Table fr_table (2, 2, true);
	fr_table.set_col_spacings (10);
	fr_table.set_row_spacings (10);
	
	Gtk::Frame frame1 ("Shadow In");
	Gtk::Frame frame2 ("Shadow Out");
	Gtk::Frame frame3 ("Shadow Etched In");
	Gtk::Frame frame4 ("Shadow Etched Out");
	
	frame1.set_shadow_type (Gtk::SHADOW_IN);
	frame2.set_shadow_type (Gtk::SHADOW_OUT);
	frame3.set_shadow_type (Gtk::SHADOW_ETCHED_IN);
	frame4.set_shadow_type (Gtk::SHADOW_ETCHED_OUT);
	
	fr_table.attach (frame1, 0, 1, 0, 1);
	fr_table.attach (frame2, 0, 1, 1, 2);
	fr_table.attach (frame3, 1, 2, 0, 1);
	fr_table.attach (frame4, 1, 2, 1, 2);
	
	FramesWindow.add (fr_table);
	
	FramesWindow.show_all_children();
	
	FramesApp.run (FramesWindow);
	
	return 0;
}