diff -r cc2170ea05ad -r 46448d38885c ui/gtk/button.c
--- a/ui/gtk/button.c	Fri Nov 10 18:04:40 2017 +0100
+++ b/ui/gtk/button.c	Sat Nov 11 08:34:06 2017 +0100
@@ -99,48 +99,42 @@
     gtk_toggle_button_set_active(button, value != 0 ? TRUE : FALSE);
 }
 
+void ui_toggled_obs(GtkToggleToolButton *widget, UiVarEventData *event) {
+    UiEvent e;
+    e.obj = event->obj;
+    e.window = event->obj->window;
+    e.document = event->obj->ctx->document;
+    e.eventdata = NULL;
+    e.intval = gtk_toggle_tool_button_get_active(widget);
+    
+    UiInteger *i = event->var->value;
+    ui_notify_evt(i->observers, &e);
+}
 
-UIWIDGET ui_checkbox(UiObject *obj, char *label, UiInteger *value) {
+UIWIDGET ui_checkbox_var(UiObject *obj, char *label, UiVar *var) {
     GtkWidget *button = gtk_check_button_new_with_label(label);
     
     // bind value
-    if(value) {
+    if(var) {
+        UiInteger *value = var->value;
         value->obj = GTK_TOGGLE_BUTTON(button);
         value->get = ui_toggle_button_get;
         value->set = ui_toggle_button_set;
-        if(value->value != 0) {
-            gtk_toggle_button_set_active(value->obj, TRUE);
-        }
-    }
-    
-    UiContainer *ct = uic_get_current_container(obj);
-    ct->add(ct, button, FALSE);
-    
-    return button;
-}
-
-UIWIDGET ui_checkbox_cb(UiObject *obj, char *label, ui_callback f, void *data) {
-    GtkWidget *button = gtk_check_button_new_with_label(label);
-    
-    if(f) {
-        //UiEventData *event = ucx_mempool_malloc(
-        //        obj->ctx->mempool,
-        //        sizeof(UiEventData));
-        UiEventData *event = malloc(sizeof(UiEventData));
+        gtk_toggle_button_set_active(value->obj, value->value);
+        
+        UiVarEventData *event = malloc(sizeof(UiVarEventData));
         event->obj = obj;
-        event->userdata = data;
-        event->callback = f;
-        event->value = 0;
+        event->var = var;
 
         g_signal_connect(
                 button,
                 "clicked",
-                G_CALLBACK(ui_button_toggled),
+                G_CALLBACK(ui_toggled_obs),
                 event);
         g_signal_connect(
                 button,
                 "destroy",
-                G_CALLBACK(ui_destroy_userdata),
+                G_CALLBACK(ui_destroy_vardata),
                 event);
     }
     
@@ -150,10 +144,30 @@
     return button;
 }
 
+UIWIDGET ui_checkbox(UiObject *obj, char *label, UiInteger *value) {
+    UiVar *var = NULL;
+    if(value) {
+        var = malloc(sizeof(UiVar));
+        var->value = value;
+        var->type = UI_VAR_SPECIAL;
+    }
+    return ui_checkbox_var(obj, label, var);
+}
+
+UIWIDGET ui_checkbox_nv(UiObject *obj, char *label, char *varname) {
+    UiVar *var = uic_create_var(obj->ctx, varname, UI_VAR_INTEGER);
+    return ui_checkbox_var(obj, label, var);
+}
 
 
-UIWIDGET ui_radiobutton(UiObject *obj, char *label, UiInteger *rgroup) {
-    GSList *rg = rgroup ? rgroup->obj : NULL;
+UIWIDGET ui_radiobutton_var(UiObject *obj, char *label, UiVar *var) {
+    GSList *rg = NULL;
+    UiInteger *rgroup;
+    
+    if(var) {
+        rgroup = var->value;
+        rg = rgroup->obj;
+    }
     
     GtkWidget *rbutton = gtk_radio_button_new_with_label(rg, label);
     rg = gtk_radio_button_get_group(GTK_RADIO_BUTTON(rbutton));
@@ -162,9 +176,23 @@
         rgroup->obj = rg;
         rgroup->get = ui_radiobutton_get;
         rgroup->set = ui_radiobutton_set;
-        if(rgroup->value > 0) {
-            ui_radiobutton_set(rgroup, rgroup->value);
-        }
+        
+        ui_radiobutton_set(rgroup, rgroup->value);
+        
+        UiVarEventData *event = malloc(sizeof(UiVarEventData));
+        event->obj = obj;
+        event->var = var;
+        
+        g_signal_connect(
+                rbutton,
+                "clicked",
+                G_CALLBACK(ui_radio_obs),
+                event);
+        g_signal_connect(
+                rbutton,
+                "destroy",
+                G_CALLBACK(ui_destroy_vardata),
+                event);
     }
     
     UiContainer *ct = uic_get_current_container(obj);
@@ -173,13 +201,42 @@
     return rbutton;
 }
 
+UIWIDGET ui_radiobutton(UiObject *obj, char *label, UiInteger *rgroup) {
+    UiVar *var = NULL;
+    if(rgroup) {
+        var = malloc(sizeof(UiVar));
+        var->value = rgroup;
+        var->type = UI_VAR_SPECIAL;
+    }
+    return ui_radiobutton_var(obj, label, var);
+}
+
+UIWIDGET ui_radiobutton_nv(UiObject *obj, char *label, char *varname) {
+    UiVar *var = uic_create_var(obj->ctx, varname, UI_VAR_INTEGER);
+    return ui_radiobutton_var(obj, label, var);
+}
+
+void ui_radio_obs(GtkToggleToolButton *widget, UiVarEventData *event) {
+    UiInteger *i = event->var->value;
+    
+    UiEvent e;
+    e.obj = event->obj;
+    e.window = event->obj->window;
+    e.document = event->obj->ctx->document;
+    e.eventdata = NULL;
+    e.intval = i->get(i);
+    
+    ui_notify_evt(i->observers, &e);
+}
+
 int ui_radiobutton_get(UiInteger *value) {
     int selection = 0;
     GSList *ls = value->obj;
     int i = 0;
+    guint len = g_slist_length(ls);
     while(ls) {
         if(gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(ls->data))) {
-            selection = g_slist_length(value->obj) - i - 1;
+            selection = len - i - 1;
             break;
         }
         ls = ls->next;
@@ -203,6 +260,6 @@
         j++;
     }
     
-    value->value = j;
+    value->value = i;
 }