c# 4.0 - Textbox focus does not work when focus by mouseclick wpf -

when click on text box mouse focus not display. , when goes textbox keyboard focus displayed. trying below code. please can 1 suggest me how solve issue.

 <style x:key="textboxfocusvisualstyle" >      <setter property="control.template">           <setter.value>                <controltemplate>                         <image source="/mit;component/resources/txtfocus.png"  stretch="fill"  margin="-8,-6,-8,-6"/>                </controltemplate>           </setter.value>      </setter>  </style>  <textbox  grid.column="2" height="44" margin="20,48,0,0" name="txtemailid" verticalalignment="top" keyboardnavigation.tabindex="2" maxwidth="400" horizontalalignment="left" width="350" text=""  focusvisualstyle="{dynamicresource textboxfocusvisualstyle}" verticalcontentalignment="center" fontweight="semibold" fontsize="18" contextmenu="{x:null}" /> 

i tried below code after @hattenn answer:

<application x:class="wpfapplication1.app"              xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"              startupuri="mainwindow.xaml">     <application.resources>            <style x:key="textboxstyle" targettype="{x:type textbox}">             <style.triggers>                 <trigger property="isfocused" value="true">                     <setter property="background">                         <setter.value>                             <visualbrush>                                 <visualbrush.visual>                                     <grid>                                         <image source="/wpfapplication1;component/resources/txtfocus.png"  stretch="fill"  margin="-8,-6,-8,-6"/>                                     </grid>                                 </visualbrush.visual>                             </visualbrush>                         </setter.value>                     </setter>                 </trigger>             </style.triggers>         </style>       </application.resources> 

and

<textbox height="23" name="textbox1" width="120" focusable="true" focusvisualstyle="{dynamicresource textboxstyle}"/> 

but not work me. nothing happened. please suggest. thanks

focusvisualstyle keyboard focus, can check out here:

http://msdn.microsoft.com/en-us/library/system.windows.frameworkelement.focusvisualstyle.aspx

for general focus, can use isfocused property, more info below:

http://msdn.microsoft.com/en-us/library/system.windows.uielement.isfocused.aspx

as example, can try this:

<style x:key="textboxstyle" targettype="{x:type textbox}">     <style.triggers>         <trigger property="isfocused" value="true">             <setter property="background">                 <setter.value>                     <visualbrush>                         <visualbrush.visual>                             <grid>                                 <image source="/mit;component/resources/txtfocus.png"  stretch="fill"  margin="-8,-6,-8,-6"/>                             </grid>                         </visualbrush.visual>                     </visualbrush>                 </setter.value>             </setter>         </trigger>     </style.triggers> </style>