Parse Syntax Error when using ".on" Listener

[JasonBrannon]

When attempting to configure dc Listener

Receive a "unable to evaldcOn:'filtered', filterCalled();" error when configuring the .on listener:

Syntax Error: Token ',' is an unexpected token at column 11 of the expression ['filtered', filterCalled();] starting at [, filterCalled()].

//Function within controller scope:
$scope.filterCalled = function() {
console.log("Filtered Called ")
}

//Control

<div dc-chart="pieChart "
dc-width="160 "
dc-height="160 "
dc-on="'filtered', filterCalled() "
dc-inner-radius="60 "
dc-dimension="certDim "
dc-group="certGrp "
class="dc-chart "></div>
`