diff --git a/src/add_request_dialog.cc b/src/add_request_dialog.cc
index d6e31e0..d93c223 100644
--- a/src/add_request_dialog.cc
+++ b/src/add_request_dialog.cc
@@ -30,18 +30,21 @@
 
 #include "gettext.h"
 
+#include <gtkmm/spinbutton.h>
+
 using namespace sgpem;
 using namespace Gtk;
 using namespace Glib;
 using Gnome::Glade::Xml;
 
 AddRequestDialog::AddRequestDialog(BaseObjectType* cobject, const RefPtr<Xml>& glade) :
-  Dialog(cobject)
+  Dialog(cobject), _glade(glade)
 {
-  glade->get_widget("SubRequests.View", _list);
-  glade->get_widget("Add", _add_button);
-  glade->get_widget("Add", _remove_button);
-  glade->get_widget("Resource.Combo", _resource_combo);
+  _glade->get_widget("SubRequests.View", _list);
+  _glade->get_widget("Add", _add_button);
+  _glade->get_widget("Remove", _remove_button);
+  _glade->get_widget("Resource.Combo", _resource_combo);
+  
   
   /** ATTACH SIGNAL HANDLERS FOR BUTTONS **/
   
@@ -54,26 +57,33 @@ AddRequestDialog::AddRequestDialog(BaseObjectType* cobject, const RefPtr<Xml>& g
 
   _combo_model = ListStore::create(_combo_columns);
   _resource_combo->set_model(_combo_model);
+  _resource_combo->pack_start(_combo_key_column, false);
+  _resource_combo->pack_start(_combo_resource_column, true);
   
   /** INITIALIZE LISTVIEW **/
   
+  _list_columns.add(_list_key_column);
   _list_columns.add(_list_resource_column);
   _list_columns.add(_list_length_column);
   
   _list_model = ListStore::create(_list_columns);
   _list->set_model(_list_model);
 
+  _list->append_column(_("key"), _list_key_column);
   _list->append_column(_("resource"), _list_resource_column);
   _list->append_column(_("length"), _list_length_column);
+
+  _list->get_selection()->signal_changed().connect(
+      sigc::mem_fun(*this, &AddRequestDialog::_on_selection_changed));
 }
   
 void
 AddRequestDialog::on_show()
 {
+  //TODO is this a reasonable place where to fill the combo model?
+  
   typedef Environment::Resources::const_iterator ResourceIt;
   
-  Dialog::on_show();
-
   const Environment::Resources& resources = 
     Simulation::get_instance().get_history().get_last_environment().get_resources();
   
@@ -85,17 +95,45 @@ AddRequestDialog::on_show()
     row[_combo_key_column] = it->first;
     row[_combo_resource_column] = it->second->get_name();
   }
+
+  Dialog::on_show();
 }
 
 void
 AddRequestDialog::_on_add()
 {
-  //TODO
+  TreeModel::iterator sel = _resource_combo->get_active();
+
+  if(sel)
+  {
+    SpinButton* duration_spin;
+  
+    _glade->get_widget("Duration.Spin", duration_spin);
+
+    TreeModel::Row row = *(_list_model->append());
+
+    const unsigned int key = (*sel)[_combo_key_column];
+    row[_list_key_column] = key;
+
+    const ustring resource = (*sel)[_combo_resource_column];
+    row[_list_resource_column] = resource;
+
+    const unsigned int length = duration_spin->get_value_as_int();
+    row[_list_length_column] = length;
+  }
 }
 
 void
 AddRequestDialog::_on_remove()
 {
-  //TODO
+  TreeModel::iterator it = _list->get_selection()->get_selected();
+  _list_model->erase(it);
+}
+
+void 
+AddRequestDialog::_on_selection_changed()
+{
+  _remove_button->set_sensitive(
+      _list->get_selection()->count_selected_rows() > 0);
 }
 
diff --git a/src/add_request_dialog.hh b/src/add_request_dialog.hh
index 768c9d7..72ac757 100644
--- a/src/add_request_dialog.hh
+++ b/src/add_request_dialog.hh
@@ -42,10 +42,13 @@ namespace sgpem
   private:
     void _on_add();
     void _on_remove();
+    void _on_selection_changed();
     
+    Glib::RefPtr<Gnome::Glade::Xml> _glade;
     Gtk::TreeView* _list;
     Glib::RefPtr<Gtk::ListStore> _list_model;
     Gtk::TreeModelColumnRecord _list_columns;
+    Gtk::TreeModelColumn<unsigned int> _list_key_column;
     Gtk::TreeModelColumn<Glib::ustring> _list_resource_column;
     Gtk::TreeModelColumn<unsigned int> _list_length_column;
 
diff --git a/src/schedulables_tree_widget.cc b/src/schedulables_tree_widget.cc
index 630c1a4..85d3d43 100644
--- a/src/schedulables_tree_widget.cc
+++ b/src/schedulables_tree_widget.cc
@@ -25,6 +25,7 @@
 #include "backend/process.hh"
 #include "backend/thread.hh"
 #include "backend/resource.hh"
+#include "add_request_dialog.hh"
 
 #include <iostream>
 #include <sstream>
@@ -60,8 +61,9 @@ SchedulablesTreeWidget::SchedulablesTreeWidget() :
 /** DIALOGS **/
   _add_process_dialog_glade->get_widget("AddProcessDialog", _add_process_dialog);
   _add_thread_dialog_glade->get_widget("AddThreadDialog", _add_thread_dialog);
-  // TODO use a derived widget
-  _add_request_dialog_glade->get_widget("AddRequestDialog", _add_request_dialog);
+  // NOTE This is *not* reflective programming! AddRequestDialog is the name of
+  // the base widget in the glade file.
+  _add_request_dialog_glade->get_widget_derived("AddRequestDialog", _add_request_dialog);
   
   set_headers_visible(false);
 
diff --git a/src/schedulables_tree_widget.hh b/src/schedulables_tree_widget.hh
index 088e0f8..b0d9a3d 100644
--- a/src/schedulables_tree_widget.hh
+++ b/src/schedulables_tree_widget.hh
@@ -25,6 +25,7 @@ namespace sgpem
 {
   class Process;
   class Thread;
+  class AddRequestDialog;
 }
 
 #include "config.h"
@@ -84,7 +85,7 @@ namespace sgpem
     Glib::RefPtr<Gnome::Glade::Xml> _add_request_dialog_glade;
     Gtk::Dialog* _add_process_dialog;
     Gtk::Dialog* _add_thread_dialog;
-    Gtk::Dialog* _add_request_dialog;
+    AddRequestDialog* _add_request_dialog;
   };
 
 } //~ namespace sgpem