wpf - Binding DataGirdComboBoxColumn to DataSet doesn't work -

i want create simple master-detail view in datagrid.
tried bind datagirdcomboboxcolumn dataset, won't work.

here's xaml code:

<datagrid x:name="datagrid1" grid.column="0" grid.row="0" alternatingrowbackground="#fff0f0f0" itemssource="{binding}" height="420" autogeneratecolumns="false">     <datagrid.columns>         <datagridtextcolumn header="id" binding="{binding airplaneid}" isreadonly="true" minwidth="30"/>         <datagridtextcolumn header="model" binding="{binding model}" isreadonly="true" width="auto" minwidth="160"/>         <datagridtextcolumn header="fuel" binding="{binding fuel}" minwidth="50" />          <datagridcomboboxcolumn x:name="comboboxcolumnpass" header="passenger" displaymemberpath="name"                                         selectedvaluebinding="{binding airplaneid, mode=twoway, updatesourcetrigger=propertychanged}" selectedvaluepath="airplaneid"/>        </datagrid.columns>     <datagrid.contextmenu>         <contextmenu>             <menuitem command="applicationcommands.new" tooltip="fügt eine neue zeile hinzu"/>             <menuitem command="applicationcommands.delete"  tooltip="löscht das ausgewählte element"/>         </contextmenu>     </datagrid.contextmenu>     <datagrid.rowdetailstemplate>         <datatemplate>             <stackpanel orientation="horizontal" margin="5">                 <textblock fontsize="12" textwrapping="wrap" text="{binding detail}" />             </stackpanel>         </datatemplate>     </datagrid.rowdetailstemplate> </datagrid> 

and here's c# code:

namespace wpfapplicationairplanedb {     airplanedbdataset airplanedataset = new airplanedbdataset();     airplanedbdatasettableadapters.airplanetableadapter airtableadapter = new airplanedbdatasettableadapters.airplanetableadapter();     airplanedbdatasettableadapters.passengertableadapter passtableadapter = new airplanedbdatasettableadapters.passengertableadapter();      public mainwindow()     {         initializecomponent();          airtableadapter.fill(airplanedataset.airplane);         passtableadapter.fill(airplanedataset.passenger);          datagrid1.itemssource = airplanedataset.airplane.defaultview;         comboboxcolumnpass.itemssource = airplanedataset.passenger.defaultview;      } } 

and error:

an unhandled exception of type 'system.invalidoperationexception' occurred in presentationframework.dll additional information: twoway- oder onewaytosource-bindungen funktionieren nicht mit der schreibgeschützten eigenschaft "airplaneid" vom typ "system.data.datarowview".

(sorry german language exception)

it seems airplaneid readonly. either make writeable or change binding oneway.