what is the purpose of avoiding button press in the samplelight init function ？

Hi everyone！

it is coding as below  in samplelight init function：

#if (defined HAL_BOARD_ZLIGHT) || (defined HAL_PWM)
  HalTimer1Init( 0 );
  halTimer1SetChannelDuty( WHITE_LED, 0 );
  halTimer1SetChannelDuty( RED_LED, 0 );
  halTimer1SetChannelDuty( BLUE_LED, 0 );
  halTimer1SetChannelDuty( GREEN_LED, 0 );

  // find if we are already on a network from NV_RESTORE
  uint8 state;
  NLME_GetRequest( nwkNwkState, 0, &state );

  if ( state < NWK_ENDDEVICE )
  {
    // Start EZMode on Start up to avoid button press
    osal_start_timerEx( zclSampleLight_TaskID, SAMPLELIGHT_START_EZMODE_EVT, 500 );
  }
#if ZCL_LEVEL_CTRL
  zclSampleLight_DefaultMove();
#endif
#endif // #if (defined HAL_BOARD_ZLIGHT) || (defined HAL_PWM)

    i using this sample to test whether a light level could be controled or  not ！

    but i don't know why  it is  different with other sample（just include on off function） in  init function。

    why does it need to avoid button press？

BR!