Fabio, it might have to do with what your middle button is programmed for. I use mine for a 'double click'. When I hold the middle button, the TAB key is ignored.

Alan

>Hi,
>
>1. Tab on a TextBox Control
>2. Hold down mouse left ( or right ) button on it
>3. Press keyboard TAB
>* key is not processed
>4. release mouse button
>* keyboard queue is processed
>
>Now
>
>1. Tab on a TextBox Control
>2. Hold down mouse middle button on it
>3. Press keyboard TAB
>* keyboard queue is processed, and focus go on another control
>4. release mouse button
>
>
>a) It is correct ?
>
>b) It is a windows standard ?
>
>c) I can stop keyboard queue processing when middle click is hold down ?
>
>
>Fabio