Copy/paste toolbar item from form-a to form-b

[hpw4711]

The copy of a toolbar-item from form-a and paste on form-b toolbar will fail (reader error):

1. if the toolbar item has already an OnClick assigend.
2. without any On-Properties there is no such issue!

Fix:

1. The DsgnItemEditor needs your own DesignWindows.pas

2. In the TDesignWindow add private error handler:

   procedure ReaderErrorHandler (Reader: TReader; const Message: string; var Handled: Boolean);

3. Handler proc:

procedure TDesignWindow.ReaderErrorHandler (Reader: TReader; const Message: string; var Handled: Boolean);

Begin
ShowMessage ('Reader Error on component and property: >>' + Message + '<<');
Handled := True;
End;

1. on procedure TDesignWindow.PasteComponents

add the OnError

try
  R.OnError   := ReaderErrorHandler;
  R.OnSetName := ReaderSetName;