mixing widgets via glade and standard way ? (newbie)

[Fred Müller <fmue pab-opto de>]

Dear folks,

I'm wondering whether XML/glade based widget creation and 'standard' 
widget creation combine.
All widgets are generated by libglade-2.0. Changing the text in an 
existing label works, adding a label to the table doesn't:

{
       GtkWidget *l, *tl;
       if( !(tl=glade_xml_get_widget( pgcw.xml, 
"table_mancontrol_lamps" )) ) {
               fprintf(stderr,"%s: can't get lamp table widget\n", 
__func__ );
               return(-1);
       }
       l=gtk_label_new("foo");
       gtk_table_attach_defaults( GTK_TABLE(tl), l, 2,3,2,3 );
       return(0);
}

Are standard gtk calls failing since glade changes some internal 
callbacks when creating the table, or am I missing something obvious ? 
(I wouldn't think its some buffer issue, since the above routine gets 
called once via g_idle_add and the label doesn't appear after 
resizing/iconify). table size is 4x4 in the XML file.

Second question:

Entries to a notebook all use the same layout and different variable 
space. The layout for the first page is generated, amongst the rest of 
the GUI, using XML/libglade, the others are to be cloned at runtime 
(number of notebook pages is only kown at runtime). What's the "good" 
way to do this ?
I realize one way is to use glade_xml_new with root and domain options 
and attached the tree at the notebook. Right ?
Is there a general way to cut/paste a widget subtree to a different node 
within Gtk ?

many thanks for any light&insight
regards
Fred