c# - key does not exist in style -


i learning trigger in wpf. here trigger demo when write code similar tutorial show "the property key not exist"

my code 

<window.resources>         <style x:key="buttonstyle" targettype="{x:type button}">          </style>     </window.resources>     <grid>          <grid.rowdefinitions>             <rowdefinition height="*"></rowdefinition>             <rowdefinition height="*"></rowdefinition>             <rowdefinition height="*"></rowdefinition>             <rowdefinition height="auto"></rowdefinition>         </grid.rowdefinitions>         <grid.columndefinitions>             <columndefinition width="*"></columndefinition>             <columndefinition width="*"></columndefinition>             <columndefinition width="*"></columndefinition>             <columndefinition width="auto"></columndefinition>         </grid.columndefinitions>         <button content="my button" horizontalalignment="left" verticalalignment="top" maxwidth="100" padding="6" margin="8"/>      </grid>

k in key needs in capital x:key

make sure have included namespace 'x'

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" in windows tag


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