c# - popup control not scrolling -


the list behind popup scrolling not content of popup. missing something?

 <grid x:name="layoutroot">             <grid.projection>                 <planeprojection/>             </grid.projection>              <grid.background>                 <imagebrush imagesource="/assets/common/bg.png"/>             </grid.background>              <grid.rowdefinitions>                 <rowdefinition height="auto"/>                 <rowdefinition height="auto"/>                 <rowdefinition />             </grid.rowdefinitions>              <mycontrols:header title="event calender" menuclickedcommand="{binding menuclicked}" />              <grid grid.row="1" margin="20">                 <grid.columndefinitions>                     <columndefinition width="*" />                     <columndefinition width="*" />                     <columndefinition width="auto"/>                 </grid.columndefinitions>                  <image grid.column="0" source="/assets/event/btn_byday.png" />                 <image grid.column="1" source="/assets/event/btn_byvenue.png" />                 <image margin="20,0" tap="image_tap" verticalalignment="center" horizontalalignment="center" grid.column="2" source="/assets/event/icon_callist.png" />             </grid>              <popup grid.row="2" x:name="popup" isopen="true">                 <scrollviewer width="{binding devicewidth}" >                      <stackpanel margin="20,0">                         <textblock text="item 1" margin="20"/>                         <textblock text="item 2" margin="20"/>                         <textblock text="item 3" margin="20"/>                         <textblock text="item 4" margin="20"/>                         <textblock text="item 5" margin="20"/>                         <textblock text="item 6" margin="20"/>                         <textblock text="item 7" margin="20"/>                         <textblock text="item 8" margin="20"/>                         <textblock text="item 9" margin="20"/>                         <textblock text="item 10" margin="20"/>                         <textblock text="item 11" margin="20"/>                         <textblock text="item 12" margin="20"/>                         <textblock text="item 13" margin="20"/>                         <textblock text="item 14" margin="20"/>                         <textblock text="item 15" margin="20"/>                         <textblock text="item 16" margin="20"/>                     </stackpanel>                 </scrollviewer>             </popup>              <scrollviewer grid.row="2" margin="20,0">                 <stackpanel>                     <itemscontrol itemssource="{binding eventslist}">                         <itemscontrol.itemtemplate>                             <datatemplate>                                 <mycontrols:eventdetails />                             </datatemplate>                         </itemscontrol.itemtemplate>                     </itemscontrol>                                     </stackpanel>             </scrollviewer>         </grid>

ps: reason scrollviewer has taken height required show content. how can avoid that?


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