wpf - Overlapping of Expander boundaries -


the xaml code below overlaps boundaries of expander. when run this, , click first expander option, expand , show rich text box. cannot scroll it. no problem second expander. how solve problem?

    <expander header="certificate" margin="201,85,101,143">         <scrollviewer width="283" height="106">             <richtextbox name="richtextbox1" margin="0,0,0,0" height="82" width="221">             <flowdocument>                 <paragraph>                     00 10 12 11 01 02 00 10 12 11 01 02 00 10 12 11 01 02                     00 10 12 11 01 02 00 10 12 11 01 02 00 10 12 11 01 02                     00 10 12 11 01 02 00 10 12 11 01 02 00 10 12 11 01 02                     00 10 12 11 01 02 00 10 12 11 01 02 00 10 12 11 01 02                     00 10 12 11 01 02 00 10 12 11 01 02 00 10 12 11 01 02                     00 10 12 11 01 02 00 10 12 11 01 02 00 10 12 11 01 02                     00 10 12 11 01 02 00 10 12 11 01 02 00 10 12 11 01 02                     00 10 12 11 01 02 00 10 12 11 01 02 00 10 12 11 01 02                 </paragraph>             </flowdocument>         </richtextbox>         </scrollviewer>     </expander>      <expander header="challenge" margin="201,122,86,81">         <scrollviewer width="283" height="106">             <richtextbox name="richtextbox2" margin="0,0,0,0" height="82" width="221">                 <flowdocument>                     <paragraph>                     11 11 11 11 11 11 11 11 11 12 11 01 02 00 10 12 11 01                     00 10 12 11 01 02 00 10 12 11 01 02 00 10 12 11 01 02                     00 10 12 11 01 02 00 10 12 11 01 02 00 10 12 11 01 02                     00 10 12 11 01 02 00 10 12 11 01 02 00 10 12 11 01 02                     00 10 12 11 01 02 00 10 12 11 01 02 00 10 12 11 01 02                     00 10 12 11 01 02 00 10 12 11 01 02 00 10 12 11 01 02                     00 10 12 11 01 02 00 10 12 11 01 02 00 10 12 11 01 02                     </paragraph>                 </flowdocument>             </richtextbox>         </scrollviewer>     </expander> 

<stackpanel>     <expander header="certificate" >                  <richtextbox name="richtextbox1" width="283" height="106" scrollviewer.verticalscrollbarvisibility="auto">             <flowdocument>                 <paragraph>                     00 10 12 11 01 02 00 10 12 11 01 02 00 10 12 11 01 02                 00 10 12 11 01 02 00 10 12 11 01 02 00 10 12 11 01 02                 00 10 12 11 01 02 00 10 12 11 01 02 00 10 12 11 01 02                 00 10 12 11 01 02 00 10 12 11 01 02 00 10 12 11 01 02                 00 10 12 11 01 02 00 10 12 11 01 02 00 10 12 11 01 02                 00 10 12 11 01 02 00 10 12 11 01 02 00 10 12 11 01 02                 00 10 12 11 01 02 00 10 12 11 01 02 00 10 12 11 01 02                 00 10 12 11 01 02 00 10 12 11 01 02 00 10 12 11 01 02                 </paragraph>             </flowdocument>         </richtextbox>        </expander>  <expander header="challenge" >                      <richtextbox name="richtextbox2" width="283" height="106" scrollviewer.verticalscrollbarvisibility="auto" >             <flowdocument>                 <paragraph>                     11 11 11 11 11 11 11 11 11 12 11 01 02 00 10 12 11 01                 00 10 12 11 01 02 00 10 12 11 01 02 00 10 12 11 01 02                 00 10 12 11 01 02 00 10 12 11 01 02 00 10 12 11 01 02                 00 10 12 11 01 02 00 10 12 11 01 02 00 10 12 11 01 02                 00 10 12 11 01 02 00 10 12 11 01 02 00 10 12 11 01 02                 00 10 12 11 01 02 00 10 12 11 01 02 00 10 12 11 01 02                 00 10 12 11 01 02 00 10 12 11 01 02 00 10 12 11 01 02                 </paragraph>             </flowdocument>         </richtextbox>       </expander>  </stackpanel> 

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