c# - ScrollViewer wpf - doesn't work -

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i have wpf application. in window have textblock contains lot of numbers , each number in it's row. want scrollviewer appear when needed. doesn't work... here code 

<scrollviewer cancontentscroll="true" margin="5,25,5,0" grid.row="2" horizontalscrollbarvisibility="auto" >                  <textblock maxheight="500" height="auto" width="auto" verticalalignment="top" name="textblock_results"/>         </scrollviewer>

the text block in scroll viewer not capable of scrolling default. enable scrollviewer perform pixel based scrolling need set can content scroll false.

the visibillity of 2 scroll bars controlled independently. have hidden vertical scroll bar in 1 bellow.

<window x:class="wpfapplication1.mainwindow"     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"     title="mainwindow" height="350" width="525"> <grid>     <scrollviewer cancontentscroll="false" margin="5,25,5,0" grid.row="2" horizontalscrollbarvisibility="auto"  verticalscrollbarvisibility="hidden">         <textblock maxheight="500" height="auto" width="auto" verticalalignment="top" name="textblock_results"                   text="a"/>     </scrollviewer>  </grid>


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