Windows Phone 8 Development

<b></b>I am using the silverlight toolkit for listpicker but I dont know how to expand it to a new page which should give all the listpickeritems I have added to choose from them. currently it is giving an exception.

here is my list picker xaml code

<toolkit:listpicker margin="190,351,10,0" verticalalignment="Top" x:name="listPicker2" canvas.zindex="2" >
            <toolkit:listpickeritem content="16.5" />
            <toolkit:listpickeritem content="17" />
            <toolkit:listpickeritem content="18" />
            <toolkit:listpickeritem content="19" />
            <toolkit:listpickeritem content="20" />
            <toolkit:listpickeritem content="21" />
            <toolkit:listpickeritem content="22" />
            <toolkit:listpickeritem content="23" />
            <toolkit:listpickeritem content="24" />
            <toolkit:listpickeritem content="25" />
            <toolkit:listpickeritem content="26" />
            <toolkit:listpickeritem content="27" />
            <toolkit:listpickeritem content="28" />
            <toolkit:listpickeritem content="29" />
            <toolkit:listpickeritem content="30" />
            <toolkit:listpickeritem content="31" />
            <toolkit:listpickeritem content="32" />
        </toolkit:listpicker>