--- a/ui/win32/toolkit.c	Wed Dec 31 10:06:15 2025 +0100
+++ b/ui/win32/toolkit.c	Wed Dec 31 10:34:29 2025 +0100
@@ -122,7 +122,7 @@
                 uint64_t id = LOWORD(wParam);
                 UiCommand *cmd = cxMapGet(win->obj->ctx->command_map, id);
                 if (cmd) {
-                    cmd->callback(win->obj, cmd->userdata);
+                    cmd->callback(win->obj, id, cmd->userdata);
                     break;
                 }
             }