xaml - How can I move an EllipsePath using animation in WPF? -

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i want make slider button using wpf. have code create circle , move when clicked.

<window x:class="wpfapplication1.mainwindow"     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"     title="mainwindow" height="350" width="525"> <grid>     <border background="lightgray" margin="167,63,224,190" cornerradius="20,20,20,20" height="40" width="80">         <path fill="red">             <path.data>                 <ellipsegeometry center="20,20" radiusx="20" radiusy="20"/>             </path.data>             <path.effect>                 <dropshadoweffect direction="270" shadowdepth="2" color="gray"></dropshadoweffect>             </path.effect>             <path.triggers>                 <eventtrigger routedevent="border.mousedown">                     <eventtrigger.actions>                         <beginstoryboard>                             <storyboard>                                 <pointanimation storyboard.targetproperty="center" duration="0:0:0.3" from="20,20" to="60,20"></pointanimation>                             </storyboard>                         </beginstoryboard>                     </eventtrigger.actions>                 </eventtrigger>             </path.triggers>         </path>     </border> </grid>

it okey shows when program started. throws exception when clicked on it. error system.invalidoperationexception. how can fix problem?

perhaps closer looking do?

<window x:class="mainwindow"     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"     xmlns:d="http://schemas.microsoft.com/expression/blend/2008"     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"     xmlns:local="clr-namespace:wpfapplication1"     mc:ignorable="d"     title="mainwindow" height="350" width="525"> <grid>     <border background="lightgray" margin="167,63,224,190" cornerradius="20,20,20,20" height="40" width="80">         <canvas>             <ellipse fill="red" width="40" height="40" canvas.left="0" canvas.top="0">                 <ellipse.effect>                     <dropshadoweffect direction="270" shadowdepth="2" color="gray"></dropshadoweffect>                 </ellipse.effect>                 <ellipse.triggers>                     <eventtrigger routedevent="border.mousedown">                         <eventtrigger.actions>                             <beginstoryboard>                                 <storyboard>                                     <doubleanimation storyboard.targetproperty="(canvas.left)" duration="0:0:0.3" from="0" to="40" />                                 </storyboard>                             </beginstoryboard>                         </eventtrigger.actions>                     </eventtrigger>                 </ellipse.triggers>             </ellipse>         </canvas>     </border> </grid>


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