grazie, il problema dipendeva dal componente di terze parti....


ho risolto cosi:

codice:
The FindVCLWindow method returns the TcxInnerListbox object, which does not have a name. To access the TcxListBox control, please use the following code:

var
  ctrl : TWinControl;
begin

 ctrl := FindVCLWindow(Mouse.CursorPos);
 if ctrl.Name = '' then
   ShowMessage(ctrl.Owner.Name);