One instance activity

[Pablo Posada]

Hello list,
  I was wondering if someone has tried something to handle a one instance
activity.
What i want to do is cancel if someone tries to open the same activity from
the journal, and show the previous one with the document requested.

I try to handle the request in the sugarActivity file, i can find out if it
is already running and cancel the second. But the activity starts and stays
"initializing..."

Any ideas will help.
Thanks
Pablo Posada
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