diff -r a57268d20ed9 -r 7d15cad351fc ui/motif/button.c
--- a/ui/motif/button.c	Sun Dec 15 22:16:12 2024 +0100
+++ b/ui/motif/button.c	Sun Dec 15 22:53:51 2024 +0100
@@ -291,6 +291,55 @@
     }
 }
 
+void ui_bind_radiobutton(UiObject *obj, Widget rbutton, UiInteger *value, const char *varname, ui_callback onchange, void *onchangedata, int enable_group) {
+    UiVar* var = uic_widget_var(obj->ctx, obj->ctx, value, varname, UI_VAR_INTEGER);
+    if(var) {
+        UiInteger *value = var->value;
+        CxList *rb = value->obj;
+        if(!rb) {
+            // first button in the radiobutton group
+            // create a list for all buttons and use the list as value obj
+            rb = cxArrayListCreateSimple(CX_STORE_POINTERS, 4);
+            value->obj = rb;
+            value->get = ui_radiobutton_get;
+            value->set = ui_radiobutton_set;
+            
+            // the first radio button is also responsible for cleanup
+            XtAddCallback(
+                    rbutton,
+                    XmNdestroyCallback,
+                    (XtCallbackProc)destroy_list,
+                    rb);
+        }
+        cxListAdd(rb, rbutton);
+        
+        // set the radiobutton state, if the value is already set
+        if(cxListSize(rb) == value->value) {
+            XmToggleButtonSetState(rbutton, True, False);
+        }
+    }
+    
+    // the radio button needs to handle change events to update all
+    // other buttons in the radio button group
+    UiVarEventData *event = malloc(sizeof(UiVarEventData));
+    event->obj = obj;
+    event->callback = onchange;
+    event->userdata = onchangedata;
+    event->observers = NULL;
+    event->var = var;
+    event->value = enable_group;
+    XtAddCallback(
+            rbutton,
+            XmNvalueChangedCallback,
+            (XtCallbackProc)radiobutton_changed,
+            event);
+    XtAddCallback(
+            rbutton,
+            XmNdestroyCallback,
+            (XtCallbackProc)ui_destroy_eventdata,
+            event);
+}
+
 UIWIDGET ui_radiobutton_create(UiObject* obj, UiToggleArgs args) {
     Arg xargs[16];
     int n = 0;