> I have implemented what you suggested. I get a strange behavior: the first 
> time I enqueue a request for display, everything is fine. But then I cannot 
> draw any further: any subsequent call, albeit correctly enqueued in the 
> block, does nothing: the -(void)display 

Read: "at any subsequent call, albeit the block is correctly enqueued, nothing 
is done: …"

Sorry for the gibberish. 
Vincent_______________________________________________

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