Hi all, i use a TreeView with some cols. this.store = new ListStore(typeof(int), typeof(string)); ....... If i sort the "string" column by clicking the header it looks like this 10657 | Wichert 11825 | Wichert Dieter 12865 | Wich R 11505 | Wicht Theo But this is a wrong order !?! How to correct this ? /Wolfgang