xaml - Disabling the button based on items selected in the ItemsList -

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<button tooltip="duplicate" tooltipservice.showondisabled="true"             command="{binding path=duplicateentitycommand }"             commandparameter="{binding elementname=gridview, path=selecteditems}">                 <image style="{staticresource toolbarimagestyle}" source="/oneplanner;component/resources/icons/duplicate.png"></image>                 <button.style>                     <style targettype="{x:type button}" basedon="{staticresource {x:type button}}">                                                    <setter property="isenabled" value="false"/>                         <style.triggers>                             <multidatatrigger>                                 <multidatatrigger.conditions>                                     <condition binding="{binding elementname=radgridview, path=selecteditems.count}" value="1"/>                                     <condition binding="{binding path=isitemlistconstainstoyota}" value="false"/>                                 </multidatatrigger.conditions>                                 <setter property="isenabled" value="true"/>                             </multidatatrigger>                         </style.triggers>                                               </style>                 </button.style>             </button>

the button tied gridview. have enable button based on selection in selecteditems. if 1 selects 1 items in grid , item not has let string value equal toyota, button should enabled. have created method in viewmodel use commandparameter.

private bool isitemlistconstainstoyota(ilist<object> itemlist)     {         if (itemlist.first() carlist)         {             string carname= ((carlist)itemlist.first()).carnameasstring;             if (carname.equals("toyota"))             {                 return true;             }         }         return false;     }

the code far have not work. there anyway in xaml or have in viewmodel?

for duplicate entity command, can pass action<object> canexecuteaction. if false, button disabled. try passing following action<object> canexecuteparameter in icommand.

    itemlist =>     {          return isitemlistconstainstoyota(itemlist);     }

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