Problem with wait with messages

[Dave]

Hi All,

I have a handler that gets called on a regular basis via the "send  
xxx in N seconds"  command.

The handler then does some processing, but but wait for a task to  
complete, to do the wait I use:

if TaskNotDone = true then
    wait 1 second with messages
end if

I thought that this would allow other objects in the stack to  
function, but this is not the case.

How can I make it so that I can wait for the task to complete but  
allow the rest of the GUI to work?

Thanks a lot
All the Best
Dave