Well I got a work around

Code:
override:
LCDOUT $FE,$D4,"All On "

A=4095
For B = 0 to 15
pcaChannel = B                                           
    i2cControl = $6  + 4*pcaChannel                                                       
 I2CWRITE SDApin,SCLpin,i2cWriteAddress,i2cControl,[0,0,A.lowbyte,A.highbyte]
next B 


If IncButton=0 then
A=0
For B = 0 to 15
pcaChannel = B 
i2cControl = $6  + 4*pcaChannel 
    I2CWRITE SDApin,SCLpin,i2cWriteAddress,i2cControl,[0,0,A.lowbyte,A.highbyte]
next B
	Gosub SetButtonRelease
	n=0
LCDOUT $FE,$D4,"       "
endif