now tested and working

src/main.rs

@@ -22,6 +22,12 @@ fn main() {
         handler_borrowed.setup_greeter(handler.clone());
         handler_borrowed.setup_de_select(handler.clone());
     }
+    {
+        let handler_borrowed = handler.borrow();
+        let greeter = handler_borrowed.greeter.as_ref().expect("no greeter");
+        let user = handler_borrowed.user.as_ref().expect("no user");           
+        greeter.authenticate(Some(&user)).ok(); 
+    }
     let handler_builder_clone = handler.clone();
     builder.connect_signals(move |_, name| {
         let h_login_cb_clone = handler_builder_clone.clone();
@@ -158,22 +164,19 @@ impl Handler {
                 .set_text(msg);
         });
         greeter.connect_to_daemon_sync().ok();
-        greeter.authenticate(Some(&self.user.clone().unwrap())).ok();
         self.greeter = Some(greeter);
     }
 
-    fn setup_de_select(&self, handler: Rc<RefCell<Self>>) {
+    fn setup_de_select(&mut self, handler: Rc<RefCell<Self>>) {
         {
-            let mut handler_borrowed = handler.borrow_mut();
+            let session = self
-            let session = handler_borrowed
                 .greeter
                 .as_ref()
                 .expect("wheres the greeter at")
                 .get_default_session_hint()
                 .expect("no default session");
-            handler_borrowed.session = Some(String::from(session));
+            self.session = Some(String::from(session));
         }
-        let first_handler = handler.clone();
         let vbox = gtk::BoxBuilder::new()
             .orientation(gtk::Orientation::Vertical)
             .visible(true)
@@ -187,22 +190,29 @@ impl Handler {
         });
         let (name, key) = sessions.next().expect("no session");
         let first = gtk::RadioButtonBuilder::new().label(&name).build();
-        first.connect_toggled(move |_| {
+        let mut keys = Vec::new();
-            first_handler.borrow_mut().session = Some(key.clone());
+        let mut rbs = Vec::new();
-        });
+        keys.push(key);
+        rbs.push(first.clone());
         vbox.add(&first);
         for (name, key) in sessions {
-            let handler_clone = handler.clone();
             let key_clone = key.clone();
             let rb = gtk::RadioButton::new_with_label_from_widget(&first, &name);
-            rb.connect_toggled(move |_| {
+            keys.push(key);
-                handler_clone.borrow_mut().session = Some(key.clone());
+            rbs.push(rb.clone());
-            });
             vbox.add(&rb);
             if self.session.clone().expect("session not found") == key_clone {
                 rb.set_active(true);
             }
         }
+        let keys_iter = keys.iter();
+        for (rb, key) in rbs.iter().zip(keys_iter) {
+           let handler_clone = handler.clone();
+           let key_clone = key.clone();
+           rb.connect_toggled(move |_| {
+               handler_clone.borrow_mut().session = Some(key_clone.clone());
+           });
+        };
         self.de_select.as_ref().expect("no de select").add(&vbox);
         vbox.show_all()
     }