how to switch between connectable and non connectable advertising in clockhandler

this is my handler function for 5 second one shot clock

static void timeoutHandler(UArg arg)
{
// Store the event.
events |= arg;
// Wake up the application.
Semaphore_post(sem);
//making arvertisment nonconnectable
uint8_t gapProfileState;
GAPRole_GetParameter(GAPROLE_STATE,&gapProfileState);
if(gapProfileState != GAPROLE_CONNECTED)
{
uint8_t initialAdvertEnable = FALSE;
uint8_t new_advertising_event;
GAPRole_SetParameter(GAPROLE_ADVERT_ENABLED, sizeof(uint8_t),&initialAdvertEnable);
GAPRole_GetParameter(GAPROLE_STATE,&gapProfileState);
// while(gapProfileState != GAPROLE_WAITING);
new_advertising_event = GAP_ADTYPE_ADV_NONCONN_IND;
GAPRole_SetParameter( GAPROLE_ADV_EVENT_TYPE, sizeof( uint8 ), &new_advertising_event );
initialAdvertEnable = TRUE;
GAPRole_SetParameter(GAPROLE_ADVERT_ENABLED, sizeof(uint8_t),&initialAdvertEnable);

}
SensorTag_blinkLed(Board_LED2,1);
LCD_WRITE_STRING("nonconnectable", LCD_PAGE4);
Util_stopClock(&timeoutclock);//stop timer
}

i am turning off advertising then i am changing the type to non connectable advertisement then again
i am turning on the advertisementbut the type is still Connectable Undirect Advertisement on scanning by btool
what more steps are required to change the type on runtime

one more thing i have digged deeper and into the GAPRole_SetParameter function and found that

GAPRole_SetParameter(GAPROLE_ADVERT_ENABLED, sizeof(uint8_t),false);

simply turns off the advertisement and doesn't generate any event to change gap role but it is turning off the advertisment
while

new_advertising_event = GAP_ADTYPE_ADV_NONCONN_IND;
GAPRole_SetParameter( GAPROLE_ADV_EVENT_TYPE, sizeof( uint8 ), &new_advertising_event );

only changes the value of a variable that could change the advertisment type when event is generated and gapRole_taskFxn is executed
so the event is being generated by this function

GAPRole_SetParameter(GAPROLE_ADVERT_ENABLED, sizeof(uint8_t),true);

since there is a line in the end of this function definition ( gapRole_setEvent(START_ADVERTISING_EVT); )
but no event is being generated to wake up the gapRole_taskFxn task but when i try to cnnect after the handler's execution it connects once and gapRole_taskFxn task gets executed and which then update type of advertisment to nonconnectable
and then the advertisming becomes nonconnectable so my pint is why gapRole_taskFxn task is not executing after setting GAPROLE_ADVERT_ENABLED to TRUE?
please tell me the exact lines or atleast explain how the whole thing and events are working !!i need it get working.