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Open Form (Push Form) in side a timer task in Blackberry

I tried several times to figure out how to push a form to a sreen inside a timer task. but meantime it gave me errors. but ultimately i found a way to do it.

The solusion is invokelater(). To run a UI we have to run our code in event-dispatching thred. 

 class RemindTask1 extends TimerTask 
 {
      public void run() 
      {

Runnable NextScreen = new Runnable()
{
   public void run()
         {
          UiApplication.getUiApplication().popScreen(UiApplication.getUiApplication().getActiveScreen());
UiApplication.getUiApplication().pushScreen(new frmComplite());
   }
   };     

       UiApplication.getUiApplication().invokeLater(NextScreen);
     }
}
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