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);

     }

}