Bind TextBox Width from ColumnDefinition Width XAML WPF -

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in wpf project want bind textbox width property columndefinition width. now, it's not working !

i used converter (gridlengthconverter) convert data width.

this code :

<textbox grid.column="1" grid.row="1" style="{staticresource searchwhite}"  name="tbsearch" visibility="{binding relativesource={relativesource ancestortype={x:type mic:datagrid}}, path=showsearchboxes, converter={staticresource visibleconverter}}" width="{binding relativesource={relativesource findancestor,ancestortype={x:type columndefinition}}, path=width, converter={staticresource gridlengthconverter}, mode=twoway}"/>

gridlengthconverter gridlengthconverter assembly : presentationframework.

i error "unable convert data attribut 'converter'..." (translation french).

someone can helps ?

<grid>         <grid.columndefinitions>             <columndefinition name="col1" width="200"/>             <columndefinition />         </grid.columndefinitions>          <textbox width="{binding elementname=col1, path=width}"                   grid.column="0" height="20"/> </grid>

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