selected not working

My Options Array ($suburbs)
Array
(
[26] => DARWIN
[29] => ALAWA
[30] => BRINKIN
[31] => CASUARINA
[32] => COCONUT GROVE
[33] => JINGILI
[34] => LEE POINT
[35] => MILLNER
[36] => MOIL
[37] => NAKARA
[38] => NIGHTCLIFF
[39] => RAPID CREEK
[40] => TIWI
[41] => WAGAMAN
[42] => WANGURI
[44] => ANULA
[45] => KARAMA
[46] => LEANYER
)
my array of selcted options for this user ($userSuburbs)
Array
(
[26] => DARWIN
[29] => ALAWA
[30] => BRINKIN
[31] => CASUARINA
[32] => COCONUT GROVE
[33] => JINGILI
[34] => LEE POINT
[35] => MILLNER
)

My View

echo $form->select('Suburb.id',$suburbs,$userSuburbs, array('multiple'
=> true),false);

I get this list and the multiple seclect but NOTHING is selected any
idea why?

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