--- a/ui/gtk/tree.c	Sat Dec 05 11:54:58 2020 +0100
+++ b/ui/gtk/tree.c	Sat Dec 05 17:50:22 2020 +0100
@@ -493,6 +493,7 @@
     GtkWidget *combobox = ui_create_combobox(obj, listmodel, f, udata);
     UiContainer *ct = uic_get_current_container(obj);
     ct->add(ct, combobox, FALSE);
+    return combobox;
 }
 
 GtkWidget* ui_create_combobox(UiObject *obj, UiListModel *model, ui_callback f, void *udata) {