--- a/ui/gtk/list.h	Sat Jul 12 12:58:52 2025 +0200
+++ b/ui/gtk/list.h	Sat Jul 12 15:07:27 2025 +0200
@@ -98,6 +98,7 @@
     GtkListBox               *listbox;
     CxList                   *sublists; // contains UiListBoxSubList elements
     ui_sublist_getvalue_func getvalue;
+    void                     *getvaluedata;
     ui_callback              onactivate;
     void                     *onactivatedata;
     ui_callback              onbuttonclick;