diff --git a/src/gui_builder.cc b/src/gui_builder.cc
index 5d5aa34..0b6e32a 100644
--- a/src/gui_builder.cc
+++ b/src/gui_builder.cc
@@ -110,9 +110,10 @@ GuiBuilder::GuiBuilder(const std::string& gladefile)
   // Main simulation widget
   ScrolledWindow* simulation_window = NULL;
   _refXml->get_widget("SimulationScrolledWindow", simulation_window);
-  SimulationWidget* simulation_widget = manage(new SimulationWidget());
-  simulation_window->add(*simulation_widget);
-  simulation_widget->show();
+  // FIXME completely f***s up my system!
+  //SimulationWidget* simulation_widget = manage(new SimulationWidget());
+  //simulation_window->add(*simulation_widget);
+  //simulation_widget->show();
 }
 
 
diff --git a/src/schedulables_tree_widget.cc b/src/schedulables_tree_widget.cc
index b8202ac..0aef4c5 100644
--- a/src/schedulables_tree_widget.cc
+++ b/src/schedulables_tree_widget.cc
@@ -23,8 +23,12 @@
 #include "backend/history.hh"
 #include "backend/simulation.hh"
 #include "backend/process.hh"
+#include "backend/thread.hh"
+#include "backend/resource.hh"
 
 #include <iostream>
+#include <sstream>
+
 #include <gtk/gtk.h>
 #include <gtkmm/entry.h>
 #include <gtkmm/spinbutton.h>
@@ -36,46 +40,40 @@ using namespace Glib;
 using Gnome::Glade::Xml;
 
 SchedulablesTreeWidget::SchedulablesTreeWidget() :
-  _add_process_dialog_glade(Xml::create(GLADEDIR "/add-process-dialog.glade"))
+  _add_process_dialog_glade(Xml::create(GLADEDIR "/add-process-dialog.glade")),
+  _add_thread_dialog_glade(Xml::create(GLADEDIR "/add-thread-dialog.glade"))
+
 {
   _columns.add(_main_column);
+  _columns.add(_types_column);
   _columns.add(_handles_column);
   _model = TreeStore::create(_columns);
   
   set_model(_model);
 
-/** JUST A BIT OF DATA FOR TESTING **/
-  
- //Gtk::TreeModel::Row row1 = *(_model->append());
- //row1[_main_column] = ustring("ciccio");
-
- // Gtk::TreeModel::Row row2 = *(_model->append());
- // row2[_main_column] = ustring("pippo");
-
   append_column("schedulables", _main_column);
   //invisible
+  //  append_column("handles", _types_column);
   //  append_column("handles", _handles_column);
 
 /** POPUP MENU **/
   
   _action_group = Gtk::ActionGroup::create();
 
-//  _action_group->add( Gtk::Action::create("ContextMenu", "Schedulables") );
-//  _action_group->add( Gtk::Action::create("Add Process", Gtk::Stock::NEW),
-//      sigc::mem_fun(*this, &SchedulablesTreeWidget::on_action_file_new) );
   _action_group->add( Gtk::Action::create("AddProcess", "Add Process"),
       sigc::mem_fun(*this, &SchedulablesTreeWidget::_on_add_process) );
-  //_action_group->add( Gtk::Action::create("Quit", Gtk::Stock::QUIT),
-  //    sigc::mem_fun(*this, &SchedulablesTreeWidget::on_action_file_quit) );   
-
+  
+  _action_group->add( Gtk::Action::create("AddThread", "Add Thread"),
+      sigc::mem_fun(*this, &SchedulablesTreeWidget::_on_add_thread) );
+  
   _UIManager = Gtk::UIManager::create();
   _UIManager->insert_action_group(_action_group);
 
   Glib::ustring ui_info = 
         "<ui>"
         "  <popup name='PopupMenu'>"
-//        "    <menuitem action='ContextMenu'/>"
         "    <menuitem action='AddProcess'/>"
+	"    <menuitem action='AddThread'/>"
         "  </popup>"
         "</ui>";
 
@@ -84,8 +82,10 @@ SchedulablesTreeWidget::SchedulablesTreeWidget() :
 
 /** DIALOGS **/
   _add_process_dialog_glade->get_widget("AddProcessDialog", _add_process_dialog);
+  _add_thread_dialog_glade->get_widget("AddThreadDialog", _add_thread_dialog);
   //FIXME why do I need to call this? Is it reasonable?
   _add_process_dialog->hide();
+  _add_thread_dialog->hide();
   
   set_headers_visible(false);
 
@@ -119,15 +119,62 @@ SchedulablesTreeWidget::update(const History& history)
 
   _model->clear();
   
-  for(unsigned int i = 0; i < processes.size(); ++i)
+  // TODO use the new sequence iterator, it's been made for
+  // something!!!
+  for(unsigned int pi = 0; pi < processes.size(); ++pi)
   {
-    Process& p = *processes[i];
+    Process& p = *processes[pi];
 
-    TreeModel::Row row = *(_model->append());
-    row[_main_column] = p.get_name();
-    row[_handles_column] = &p;
-  }
+    TreeModel::Row prow = *(_model->append());
+    prow[_main_column] = p.get_name();
+    prow[_types_column] = htype_process;
+    prow[_handles_column] = &p;
+
+    std::vector<Thread*> threads = p.get_threads();
     
+    for(unsigned int ti = 0; ti < threads.size(); ++ti)
+    {
+      Thread& t = *threads[ti];
+
+      TreeModel::Row trow = *(_model->append(prow.children()));
+
+      trow[_main_column] = t.get_name();
+      trow[_types_column] = htype_thread;
+      trow[_handles_column] = &t;
+
+      std::vector<Request*> requests = t.get_requests();
+
+      for(unsigned int ri = 0; ri < requests.size(); ++ri)
+      {
+	Request& r = *requests[ri];
+
+	TreeModel::Row rrow = *(_model->append(trow.children()));
+	
+	std::ostringstream oss;
+	oss << "request " << ri + 1;
+	
+	rrow[_main_column] = oss.str();
+	rrow[_types_column] = htype_request;
+        rrow[_handles_column] = &r;
+
+	std::vector<SubRequest*> subrequests = r.get_subrequests();
+
+	for(unsigned int sri = 0; sri < subrequests.size(); ++sri)
+	{
+	  SubRequest& sr = *subrequests[sri];
+
+	  TreeModel::Row srrow = *(_model->append(rrow.children()));
+
+	  // we are sure the key is valid, or no?
+	  Resource& res = *(history.get_last_environment().get_resources().find(sr.get_resource_key())->second);
+
+	  srrow[_main_column] = res.get_name();
+	  srrow[_types_column] = htype_subrequest;
+	  srrow[_handles_column] = &sr;
+	}
+      }
+    }
+  }
 }
 
 void
@@ -151,3 +198,40 @@ SchedulablesTreeWidget::_on_add_process()
   _add_process_dialog->hide();
 }
 
+void
+SchedulablesTreeWidget::_on_add_thread()
+{  
+  TreeModel::iterator sel = get_selection()->get_selected();
+
+  if(!sel)
+    return;
+  
+  const void* p_handle = (*sel)[_handles_column];
+  HandleType type = (*sel)[_types_column];
+  Process* p = reinterpret_cast<Process*>(const_cast<void*>(p_handle));
+  
+  if(p == NULL || type != htype_process)
+    return;
+
+  if(_add_thread_dialog->run() == RESPONSE_OK)
+  {
+    Entry* name_entry;
+    SpinButton* cpu_time_spin;
+    SpinButton* arrival_time_spin;
+    SpinButton* base_priority_spin;
+    
+    _add_thread_dialog_glade->get_widget("Name.Entry", name_entry);
+    _add_thread_dialog_glade->get_widget("CpuTime.Spin", cpu_time_spin);
+    _add_thread_dialog_glade->get_widget("ArrivalTime.Spin", arrival_time_spin);
+    _add_thread_dialog_glade->get_widget("BasePriority.Spin", base_priority_spin);
+
+    Simulation::get_instance().get_history().add_thread(name_entry->get_text(),
+							*p, 
+							cpu_time_spin->get_value_as_int(),
+							arrival_time_spin->get_value_as_int(), 
+							base_priority_spin->get_value_as_int());
+    
+  }
+  
+  _add_thread_dialog->hide();
+}
diff --git a/src/schedulables_tree_widget.hh b/src/schedulables_tree_widget.hh
index 85dd11e..dfcf4e9 100644
--- a/src/schedulables_tree_widget.hh
+++ b/src/schedulables_tree_widget.hh
@@ -50,17 +50,30 @@ namespace sgpem
     bool on_button_press_event(GdkEventButton* event);
 
   private:
+    enum HandleType
+    {
+      htype_process,
+      htype_thread,
+      htype_request,
+      htype_subrequest,
+      htype_undefined
+    };
+    
     void _on_add_process();
+    void _on_add_thread();
     
     Glib::RefPtr<Gtk::TreeStore> _model;
     Gtk::TreeModelColumnRecord _columns;
     Gtk::TreeModelColumn<Glib::ustring> _main_column;
+    Gtk::TreeModelColumn<HandleType> _types_column;
     Gtk::TreeModelColumn<void*> _handles_column;
     Glib::RefPtr<Gtk::ActionGroup> _action_group;
     Glib::RefPtr<Gtk::UIManager> _UIManager;
     Gtk::Menu* _menu;
     Glib::RefPtr<Gnome::Glade::Xml> _add_process_dialog_glade;
+    Glib::RefPtr<Gnome::Glade::Xml> _add_thread_dialog_glade;
     Gtk::Dialog* _add_process_dialog;
+    Gtk::Dialog* _add_thread_dialog;
   };
 
 } //~ namespace sgpem