wpf - How to Style AvalonEdit ScrollBars -

i'm trying change thumb color of scrollbars in avalonedit. i've tried number of approaches:

style scrollviewer - lots of examples can't of them compile , when don't work.

use findtemplate , change thumb colors @ runtime. works in many not cases.

all want change thumb color. come'on wpf, throw me bone.

please put me out of misery , show me how.

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follow up:

i able of wanted changing default thumb style:

<usercontrol.resources>     <style x:key="{x:type thumb}"            targettype="{x:type thumb}">     <setter property="opacity" value="0.1" />     </style> </usercontrol.resources> 

however, if try add control template style, has no effect. every time think understand wpf styling, happens convince me know nothing.

based on page: msdn

you can this:

<style targettype="{x:type thumb}"  x:key="scrollbarthumb">         <setter property="template">             <setter.value>                 <controltemplate targettype="{x:type thumb}">                     <border cornerradius="2"                             background="black"                             borderbrush="red"                             borderthickness="1" />                 </controltemplate>             </setter.value>         </setter>     </style>  <style targettype="scrollbar">         <setter property="template">             <setter.value>                 <controltemplate targettype="{x:type scrollbar}">                     <grid>                         <grid.rowdefinitions>                             <rowdefinition maxheight="18" />                             <rowdefinition height="0.00001*" />                             <rowdefinition maxheight="18" />                         </grid.rowdefinitions>                         <border grid.rowspan="3" />                         <repeatbutton grid.row="0"                                       command="scrollbar.lineupcommand"                                       content="m 0 4 l 8 4 l 4 0 z" />                         <track x:name="part_track" grid.row="1" isdirectionreversed="true">                             <track.thumb>                                 <thumb style="{staticresource scrollbarthumb}" margin="1,0,1,0"/>                             </track.thumb>                         </track>                         <repeatbutton grid.row="3"                                       command="scrollbar.linedowncommand"                                       content="m 0 0 l 4 4 l 8 0 z" />                     </grid>                 </controltemplate>             </setter.value>         </setter>     </style>