The question goes to Microsoft insiders (employees). Are there any new classes, controls, etc...? Software is too expensive to build cheaply...

This is a known issue. There is a MS article about that. The problem can be resolved by calling SetRedraw(TRUE). Example: DeleteAllItems(); SetRedraw(TRUE); InsertItem(...); The problem is that DeleteAllItems resets internal counter (number of items) to -1 instead of 0.