Stuff

#include <glade/glade.h> 
#include <gtk/gtk.h>  

GladeXML * xml; 

void changer();

int main(int argc,char *argv[])  
{
	gtk_init(&argc,&argv); 
	glade_init();   
	xml = glade_xml_new("cpls.glade","window1",NULL); 
	glade_xml_signal_autoconnect(xml); 
	gtk_main(); 
	return 0;
}

void changer() 
{
   GtkWindow *filechooserdialog1;
  GtkWidget * mensagem; 
  mensagem = glade_xml_get_widget(xml,"label1");
  gtk_label_set_text(GTK_LABEL(mensagem),"Olá mundo!"); 

filechooserdialog1 = GTK_WINDOW(glade_xml_get_widget(xml, "filechooserdialog1"));

   gtk_widget_show(GTK_WIDGET(filechooserdialog1));


}