Assigning the same sound to several instruments (tracks)

Hi 

For example i have three instruments (tracks) in the instrument sheet

it would be fantastic if i could select the three by comand and in the instruments parameters choose sound - browse and for example choose GM.Tuba sound and the three tracks now have assigned the same sound by one operation,not assign one by one

If there is anyway to get this and i dont know please tell me it

Thanks

Best Wishes :)