Nested ui-chart in angular-ui-bootstrap accordion not work

[yunlzheng]

I try to use ui-chart in angular-ui-bootstrap accordion directives but it's not work.

accordion(close-others="oneAtATime")
        accordion-group(ng-repeat="group in groups")
          accordion-heading 
            | {{ group.name }}
            i.pull-right.glyphicon(ng-class="{'glyphicon-chevron-down': isopen, 'glyphicon-chevron-right': !isopen}")
          div
            div(ui-chart='group.volumeQuota', chart-options='chartOpts')
            div(ui-chart='group.instanceQuota', chart-options='chartOpts')