wpf - Cannot find governing FrameworkElement or FrameworkContentElement for target element. GradientStop -

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i have list box contains colors , each color have 7 heads choose print head color. binding variable when print head selected , color box should have styles.

<setter targetname="colorselectionrectangle" property="fill">  <setter.value>      <lineargradientbrush spreadmethod="repeat" startpoint="0,0" endpoint="25,25">          <lineargradientbrush.relativetransform>              <scaletransform scalex="0.01" scaley="0.01" />          </lineargradientbrush.relativetransform>          <gradientstop offset="0" color="white" />          <gradientstop offset="0.5" color="white" />          <gradientstop offset="0.5" color="{binding [0].item.printcolor.argb}" />          <gradientstop offset="1" color="{binding [0].item.printcolor.argb}" />      </lineargradientbrush>    </setter.value>

and error :

system.windows.data error: 2 : cannot find governing frameworkelement or frameworkcontentelement target element. bindingexpression:path=[0].item.printcolor.argb; dataitem=null; target element 'gradientstop' (hashcode=52327179); target property 'color' (type 'color')

i believe have problem because gradientstop not frameworkelement... msdn:

system.object    system.windows.threading.dispatcherobject     system.windows.dependencyobject       system.windows.freezable         system.windows.media.animation.animatable           system.windows.media.gradientstop

if notice extended system.windows.freezable class above, see class 'freezable'... means cannot modified. see freezable objects overview page @ msdn more information.


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