wpf - C# XAML - How to add a combobox to some datagrid ROWS but not others? -


i'm using key/value observable collection hold data represented in view 2 column datagrid. key values contain list of items , other key values contain single string value. using below code snippet i'm able display key values items in combobox. however, key value 'string' rows display no information , row becomes read-only. i'm trying not use code behind. doing wrong? simple solve code behind , if so, what's best approach?

    <datagrid autogeneratecolumns="false" itemssource="{binding keyvaluescollection}" horizontalalignment="left" margin="10,10,10,10">         <datagrid.columns>             <datagridtextcolumn header="field" binding="{binding description}" width="320"/>             <datagridtemplatecolumn header="value" width="330">                 <datagridtemplatecolumn.celltemplate>                     <datatemplate>                                           <combobox itemssource="{binding path=valueitems}"                                    visibility="{binding combovisible,                                    converter={staticresource booltovis}}"                                    displaymemberpath="valuename"                                    selectedvaluepath="id"                                     selectedvalue="{binding id}"                          />                     </datatemplate>                 </datagridtemplatecolumn.celltemplate>             </datagridtemplatecolumn>         </datagrid.columns>     </datagrid>

here structure of items:

public class keyvalue : propertychangedbase {     public string description { get; set; }      public list<valueitem> valueitems { get; set; }      public bool combovisible = false; }

valueitems list of id, string.

try using datatrigger predefined datatemplate items:

<datatemplate x:key="oneitem" datatype="{x:type valueitem}" >     <textbox text="{templatebinding id}" /> </datatemplate>  <datatemplate x:key="multiitems" datatype="{x:type valueitem}" >     <combobox itemssource="{templatebinding valueitems}"                    displaymemberpath="valuename"                    selectedvaluepath="id"                     selectedvalue="{templatebinding id}" /> </datatemplate>

and use content control place style accordingly. haven't tried data items have "hasmultiplevalueitems" boolean flag easy binding.

<datagridtemplatecolumn header="value" width="330">     <datagridtemplatecolumn.celltemplate>                             <datatemplate>             <contentcontrol content="{binding}">                 <contentcontrol.style>                     <style targettype="{x:type contentcontrol}">                         <setter property="contenttemplate" value="{staticresource oneitem}" />                         <style.triggers>                             <datatrigger binding="{binding hasmultiplevalueitems}" value="true">                                 <setter property="contenttemplate" value="{staticresource multiitems}" />                             </datatrigger>                         </style.triggers>                     </style>                 </contentcontrol.style>             </contentcontrol>                               </datatemplate>     </datagridtemplatecolumn.celltemplate> </datagridtemplatecolumn>

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