xaml - ScrollViewer not showing C# -

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i new c# , not understand scrollviewer. please see code below , tell me why no scroll bar becomes visible when below mentiond groupbox gets displayed on screen. highly appreciated.

<scrollviewer scrollviewer.verticalscrollbarvisibility="auto" grid.row="5">     <groupbox name="grpdetail"  margin="5"  height="auto" grid.row="5" scrollviewer.verticalscrollbarvisibility="visible">         <my2:ucdisbursmentdetail grid.row="5" x:name="ucdisbursmentdetail" visibility="collapsed"></my2:ucdisbursmentdetail>     </groupbox> </scrollviewer>

your scrollviewer bigger it's content therefore doesn't need show scrollbar. add height it

<scrollviewer height="300">     ... </scrollviewer>

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