wpf - How to find the thumb of a slider to set its width -

i creating "range slider" 3 slider controls stacked on top of each other. basic idea here uses 2 sliders.

http://www.thejoyofcode.com/creating_a_range_slider_in_wpf_and_other_cool_tips_and_tricks_for_usercontrols_.aspx

i'm adding third slider thumb fill space between the thumbs other slider. user able drag center thumb move 2 ends , maintain constant spacing between 2 ends.

the xaml 3 sliders. secret getting layer nicely in using control template (not reprodiced here. can find @ above url).

<grid verticalalignment="top">     <border borderthickness="0,1,0,0" borderbrush="green" verticalalignment="center" height="1"              margin="5,0,5,0"/>      <slider x:name="lowerslider"             minimum="{binding elementname=root, path=minimum}"             maximum="{binding elementname=root, path=maximum}"             value="{binding elementname=root, path=lowervalue, mode=twoway}"             margin="0,0,0,0"             template="{staticresource simpleslider}"             />      <slider x:name="middleslider"             minimum="{binding elementname=root, path=minimum}"             maximum="{binding elementname=root, path=maximum}"             value="{binding elementname=root, path=middlevalue, mode=twoway}"             margin="10,0,0,0"             template="{staticresource simpleslider}"             >    </slider>      <slider x:name="upperslider"             minimum="{binding elementname=root, path=minimum}"             maximum="{binding elementname=root, path=maximum}"             value="{binding elementname=root, path=uppervalue, mode=twoway}"             margin="20,0,0,0"             template="{staticresource simpleslider}"             /> </grid> 

as either outer thumb dragged, need resize center thumb fill space between 2 end thumbs.

in code behind, can catch movement of thumb, , can find middle slider control, can't figure out how programatically thumb of middle slider can resize fill space between 2 outer thumbs.

private void upperslider_valuechanged(object sender, routedpropertychangedeventargs<double> e)     {          slider slider= (slider) this.findname("middleslider");         // how find middleslider thumb can set         // it's width fill space between outer thumbs     } 

thanks ideas,

mitch

this should it:

var track = (track)slider.template.findname("part_track", slider); var thumb = track.thumb; thumb.width = fittingwidth; 

(by way, not way, apply multibinding 2 other sliders , converter calculates width that)