Issue with Keil V4.74

Dear All,

I have encountered a problem in simulating the following code on MDK-Lite Keil version 4.74.022. The ISR routine is not being executed during simulation with Keil V4.74 evaluation version only. This code runs on hardware and on Keil V3.36 simulator. I don't know what may be wrong with my MDK-Lite Keil version 4.74.022, maybe start-up file, but still don't know how to fix it.

Thanks for your help.

#include <LPC21xx.h>

#define LED (1<<0)


void Trigger_EXT_Int(void) __irq
{

if( (LED & IOPIN0) == LED)
{
        //checking the state of the pin
  IOCLR0=LED;
}
else
{
 IOSET0=LED;
}

   EXTINT=LED;          //CLEAR EXTENAL FLAG FOR EXTINT EGISTER
   VICVectAddr=0x00;
}


int main(void)
{

PINSEL0=0x0000000C;      //set P0.1 as external interrupt
PINSEL1=0x00000000;
IODIR0=0xFFFD;   //set as output P0.0
EXTMODE=0x01 ;   //edge sensitive is selected in EINT0 pin;
EXTPOLAR=0x0 ;   //active on negative edge on P0.1

VICIntSelect=0;  //CLASSIFIES INTERRUPTS AS EITHER FIQ or IRQ.Put a 1 for FIQ or 0 for IRQ.
VICVectCntl0=14 | 32; //channel 14 is for ext int| enable bit 5
VICIntEnable=0x00004000 ;
VICVectAddr0= (unsigned long)Trigger_EXT_Int    ;

IOCLR0=LED;

while(1);

}