xml - XAML xmldataprovider shows on runtime but not on designer -

i have following code(this code copied online example , sample not working) in order preview usercontrol during design time:

  <stackpanel  orientation="horizontal" width="200">         <stackpanel.resources>             <xmldataprovider x:key="myxmlprovider"              xpath="mydata">                 <x:xdata>                     <mydata xmlns="">                         <mydataitem mystring="test data 1"               myint="32"               mycolor="#ffaabbcc"/>                         <mydataitem mystring="test data 2"               myint="42"               mycolor="red"/>                     </mydata>                 </x:xdata>             </xmldataprovider>             <datatemplate x:key="mytemplate">                 <stackpanel background="{binding xpath=@mycolor}">                     <textblock text="{binding xpath=@myint}"/>                     <textblock text="{binding xpath=@mystring}"/>                 </stackpanel>             </datatemplate>         </stackpanel.resources>         <listbox   itemtemplate="{staticresource mytemplate}"      itemssource="{binding /mydata/mydataitem, mode=oneway, source={staticresource myxmlprovider}}"      horizontalalignment="stretch"      verticalalignment="stretch"      horizontalcontentalignment="stretch"      verticalcontentalignment="stretch"      width="100"      height="100"/> 

this code works during runtime not through designer. possible preview data on usercontrol during design time using xmldataprovider , dummy xml data? using vs professional 2015.

thanks