WPF RichTextBox inside DataGrid format is messed up -

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i need use richtextboxes in column of datagrid. done in xaml via

<datagrid x:name="ui_tblinputs"                 grid.row="0" grid.column="2" grid.rowspan="3"                 autogeneratecolumns="false"                 headersvisibility="column"                 canusersortcolumns="false"                 horizontalalignment="center"                 itemssource="{binding inputports, mode=oneway}"                 selecteditem="{binding selectedinputport}"                 selectionmode="single"                 >     <datagrid.columns>         <datagridtextcolumn                         header="inputs"                         width="sizetocells"                         minwidth="50"                         binding="{binding name, mode=twoway}"                         />         <datagridtemplatecolumn                         header="test value"                         width="sizetocells"                         minwidth="100"                         >             <datagridtemplatecolumn.celltemplate>                 <datatemplate>                     <richtextbox                                     isreadonly="true"                                     >                         <flowdocument>                             <paragraph>                                 <run text="some text"/>                             </paragraph>                         </flowdocument>                     </richtextbox>                 </datatemplate>             </datagridtemplatecolumn.celltemplate>         </datagridtemplatecolumn>     </datagrid.columns> </datagrid>

problem is, text inside richtextbox coming out each character on it's own line. i.e.

image output

any thoughts why happening?

you give datagridtemplatecolumn name like: x:name="thiscolumn" , in richtextbox set width this: 

width="{binding elementname=thiscolumn, path=actualwidth}"

update: ok problem bug here work around. set "flowdocument" width richtextbox width takes width of cell.

<datagridtemplatecolumn.celltemplate>     <datatemplate>         <richtextbox              x:name="my_rtb"             isreadonly="true">             <flowdocument                 pagewidth="{binding elementname=my_rtb, path=actualwidth}">                 <paragraph>                     <run text="some text"/>                 </paragraph>             </flowdocument>         </richtextbox>     </datatemplate> </datagridtemplatecolumn.celltemplate>

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