Author: Tomas Rutkauskas

I just found a memory leak in TCheckListBox (while using Delphi 3). Every time you 
check an item at runtime, a wrapper is created in routine TCheckListBox.GetWrapper 
in CheckLst.pas.

Answer:

These wrappers were supposed to be freed in procedure TCheckListBox.DestroyWnd; but 
this procedure is never called. Therefore all these pointers will never be freed.

The work around to this is to manually clear the listbox when the form is destroyed:

1   procedure TForm1.FormDestroy(Sender: TObject);
2   begin
3     CheckListBox1.Items.Clear;
4     inherited;
5   end;