c# - Default styles do not apply to subclasses -

i have weird scenario involving overriding default styles in wpf , having them apply subclasses. not possible? example, have following code:

<window x:class="testwpfstyling.mainwindow"         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:testwpfstyling="clr-namespace:testwpfstyling"         title="mainwindow" height="350" width="525" background="white">     <window.resources>         <style targettype="testwpfstyling:somelabel">             <setter property="foreground" value="red" />         </style>     </window.resources>     <grid>         <grid.rowdefinitions>             <rowdefinition height="auto" />             <rowdefinition height="auto" />             <rowdefinition height="auto" />         </grid.rowdefinitions>         <testwpfstyling:somelabel grid.row="0">this should red.</testwpfstyling:somelabel>         <testwpfstyling:yellowlabel grid.row="1">this should red.</testwpfstyling:yellowlabel>         <stackpanel grid.row="2">             <stackpanel.resources>                 <style targettype="testwpfstyling:somelabel">                     <setter property="foreground" value="blue" />                 </style>             </stackpanel.resources>             <testwpfstyling:somelabel>this should blue.</testwpfstyling:somelabel>             <testwpfstyling:yellowlabel>this should blue.</testwpfstyling:yellowlabel>         </stackpanel>      </grid> </window> 

with code-behind:

namespace testwpfstyling {     public partial class mainwindow : window     {     }      public class somelabel : label     {     }      public class yellowlabel : somelabel     {     } } 

i expect control yellowlabel in stackpanel have color of blue , 1 outside red, both of them black. there way subclass take on default style of parent?

actually how wpf works. have a blog post discusses wpf styling (primarily regards how our theme property works) underlying issue scenario 1 of problem 1 same describing. is, implicit local styles located using actual class type , have no relation defaultstylekey. defaultstylekey used when locating default style (i.e. style applied control based on current os theme , default generic.xaml control). 1 easy way address set style of derived control (e.g in ctor) dynamicresource reference base class' style. e.g.

this.setresourcereference(styleproperty, typeof(somelabel));