When packing a gtk label inside gtk table. I come across one problem. All the label as aligned center.
As a result i just made one ugly form. To fix the problem, use gtk_misc_set_alignment().

Gtk screenshot

See code example

#include <gtk/gtk.h>
int main (int argc, char **argv)
{
  GtkWidget *window;
  gtk_init( &amp;argc, &amp;argv);
  window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
  GtkWidget *table = gtk_table_new( 4, 1, TRUE );
  GtkWidget *label;
  label = gtk_label_new("Normal label");
  gtk_table_attach_defaults ( GTK_TABLE(table), label, 0, 1, 0, 1)
  label = gtk_label_new( "left" );
  gtk_misc_set_alignment( GTK_MISC(label), 0.0, 0.0 );
  gtk_table_attach( GTK_TABLE(table), label, 0, 1, 1, 2,
                    GTK_EXPAND|GTK_FILL, GTK_SHRINK, 0, 0 ); /*important*/
  label = gtk_label_new( "center" );
  gtk_misc_set_alignment( GTK_MISC(label), 0.5, 0.0 );
  gtk_table_attach_defaults( GTK_TABLE(table), label, 0, 1, 2, 3
                             GTK_EXPAND|GTK_FILL, GTK_SHRINK, 0, 0 ); /*important*/
  label = gtk_label_new( "right" );
  gtk_misc_set_alignment( GTK_MISC(label), 1.0, 0.0 );
  gtk_table_attach_defaults( GTK_TABLE(table), label, 0, 1, 3, 4
                             GTK_EXPAND|GTK_FILL, GTK_SHRINK, 0, 0 ); /*important*/
  gtk_widget_set_size_request (GTK_WIDGET (table), 200, 100);
  gtk_container_add( GTK_CONTAINER (window), GTK_WIDGET(table));
  gtk_widget_show_all(window);
  gtk_main();
  return 0;
}

Thanks to owl102 from gtkforums.com