TimeCntrl:

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   Perform actions specified by the time display.

   This routine is called by a callback routine in TimeGUI.m. You do not 
   normally call it yourself.

   Initialize the global as follows:

   global simulationAction
   simulationAction = ' ';

   Use the following code in your simulation loop:

   switch simulationAction
     case 'pause'
       pause
       simulationAction = ' ';
     case 'stop'
       return;
     case 'plot'
       break;
   end

   Since version 2.
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   Form:
   TimeCntrl( action )
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   ------
   Inputs
   ------
   action    (1,:) Action to take

   -------
   Outputs
   -------
   None

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