>where I must put _VFP.Autoyield = .F. ???
>I need to set it to .T. in other moment???
>What about Sys(2333) And DoEvents ???
>Can you explain me how use it???
>
>Thank you in advance

Anytime you are using ActiveX Components, AutoYield should be set to .F.
Next, when you need to make sure any pending events fire, issue the DoEvents Command.
I don't think you need Sys(2333).