Need help with interrupt

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I'm trying to learn DT's Interrupt, from the original I modify a little. I added 2 buttons to trigger the external interrupt.. but don't know how, it works only on Button 1.

INCLUDE "modedefs.bas" 
INCLUDE "DT_INTS-14.bas"     ; Base Interrupt System
INCLUDE "ReEnterPBP.bas"     ; Include if using PBP interrupts

TrisB = %00000111
PortB = %00000000
LED1   VAR  PORTB.6
x      var  byte
x=0

ASM
INT_LIST  macro    ; IntSource,        Label,  Type, ResetFlag?
        INT_Handler    INT_INT,  _ToggleLED1,   PBP,  yes
    endm
    INT_CREATE               ; Creates the interrupt processor
ENDASM

@   INT_ENABLE   INT_INT     ; enable external (INT) interrupts

Main:
  
  PAUSE 1
  High PortB.7
  pause 20
  low PortB.7
  Pause 20
GOTO Main

'---[INT - interrupt handler]---------------------------------------------------
ToggleLED1:  
     serout 5,2400, [$FE, 1]
     serout 5,2400,[254,192]
     SEROUT 5,2400,[" Val ",#x] ' Send x value to LCD
     TOGGLE LED1
     x=x+1
@ INT_RETURN

Can any one tell me what I'm missing?

thanks in advance