How To Clear The List Of Checkboxlist

I have a dependent check-box’s…

CB2 depends on CB1 .

Every thing is working so far ,

WHAT I WANT is when i check the first checkbox CB1, i get the list in CB2.

when i uncheck the CB1 the list remain in the CB2 .

I want to clear the list of CB2 if CB1 is unchecked…

echo CHtml::activeCheckBoxList($model, ‘users’, $data, array(

            // 'onchange' => 'javascript:clickedVal(this);',

            'separator' => '',

            'template' => '<div>{input} {label}</div>',



I got that solution…

thanks all