c# - How to set TextBox to be resized when DataGridTemplateColumn size changes -

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i tried stuff didn't work. maybe missed something. goal have fill horizontally column textedit , have autoresized when user change column size dragging. 

<datagrid>    <datagrid.columns>        <datagridtemplatecolumn width="200">              <datagridtemplatecolumn.headertemplate>                         <datatemplate>                             <textbox/>                         </datatemplate>              </datagridtemplatecolumn.headertemplate>        </datagridtemplatecolumn>    </datagrid.columns> </datagrid>

add header style datagrid.

<datagridtemplatecolumn width="200">     <datagridtemplatecolumn.headerstyle>          <style targettype="{x:type datagridcolumnheader}">               <setter property="horizontalcontentalignment" value="stretch"/>          </style>     </datagridtemplatecolumn.headerstyle>     <datagridtemplatecolumn.headertemplate>         ...     </datagridtemplatecolumn.headertemplate>     ...

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