morris charts set dynamically the ykeys and the labels

moriss charts have setData to change the data dynamically. i have an ajax call and it works. when the ajax call is successful i have this:

this is the object:
    var multiline1 = Morris.Area({
          element: 'trendsmultiline',
          behaveLikeLine: true,
          data: [], // Set initial data (ideally you would provide an array of default data)
          xkey: 'x',
          ykeys: ['y', 'z'],
          labels: ['air', 'lights'],
          pointSize: 0

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this works great. the thing is that i also need the ykeys and the labels dynamically, how do i do that?

the returned data array at the moment ( i am just simulating ):

        $multilinevalues = array(
            array( 'x' => "2011 Q1" , 'y' => 3, 'z' => 6 ) ,
            array( 'x' => "2011 Q2" , 'y' => 10, 'z' => 1 ) ,
            array( 'x' => "2011 Q3" , 'y' => 2 , 'z' => 4) ,
            array( 'x' => "2011 Q4" , 'y' => 3 , 'z' => 3) ,
        echo json_encode($multilinevalues);

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Rainer JeschorCommented:
you should be able to set the options like:
multiline1.options.labels = ['Other','Same'];

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This should be done BEFORE you use the setData function. If you do it afterwards, you will have to redraw the chart using

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