wpf - Why is animation starting on mouse down? -

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i have stackpanel consists of images:

<stackpanel height="115" name="stackpanel1" orientation="horizontal" margin="0">     <!-- *******************stackpanel resources****************************-->     <stackpanel.resources>         <style targettype="{x:type image}">             <style.resources>                 <storyboard x:key="storyboard1">                     <doubleanimationusingkeyframes                          storyboard.targetproperty="(frameworkelement.width)">                         <easingdoublekeyframe keytime="0:0:0.9" value="100">                             <easingdoublekeyframe.easingfunction>                                 <backease easingmode="easeout" />                             </easingdoublekeyframe.easingfunction>                         </easingdoublekeyframe>                     </doubleanimationusingkeyframes>                     <thicknessanimationusingkeyframes storyboard.targetproperty="(frameworkelement.margin)">                         <easingthicknesskeyframe keytime="0:0:0.9" value="0" />                     </thicknessanimationusingkeyframes>                 </storyboard>                 <storyboard x:key="storyboard2">                     <doubleanimationusingkeyframes storyboard.targetproperty="(frameworkelement.width)">                         <easingdoublekeyframe keytime="0:0:0.9" value="50">                             <easingdoublekeyframe.easingfunction>                                 <backease easingmode="easeout" />                             </easingdoublekeyframe.easingfunction>                         </easingdoublekeyframe>                     </doubleanimationusingkeyframes>                     <thicknessanimationusingkeyframes storyboard.targetproperty="(frameworkelement.margin)">                         <easingthicknesskeyframe keytime="0:0:0.9" value="5" />                     </thicknessanimationusingkeyframes>                 </storyboard>             </style.resources>              <setter property="width" value="60"></setter>             <setter property="stretch" value="uniform"></setter>              <style.triggers>                 <eventtrigger routedevent="mouse.mouseenter">                     <beginstoryboard storyboard="{staticresource storyboard1}" />                 </eventtrigger>                 <eventtrigger routedevent="mouse.mouseleave">                     <beginstoryboard storyboard="{staticresource storyboard2}" />                 </eventtrigger>             </style.triggers>         </style>     </stackpanel.resources>     <!-- *****************************************************************-->      <!-- ***************** stackpanel content: ************************** -->      <button command="{binding additemcommand}" style="{staticresource transparentbutton}">         <image name="imgadd" source="/wpfapp1;component/add1.png"  />     </button>      <image name="imgimport" source="/wpfapp1;component/png-symbol.png" />     <!-- ********************************************************** -->         </stackpanel>

as can see resources of stack panel contains 2 storyboards. 1 starts when mouse enters image. , anotherone plays when mouse leaves image.

if notice children of stackpanel are:

<button command="{binding additemcommand}" style="{staticresource transparentbutton}">     <image name="imgadd" source="/wpfapp1;component/add1.png"  /> </button>  <image name="imgimport" source="/wpfapp1;component/png-symbol.png" />

note 1 image wrapped inside button , other 1 not.

so question is: why storyboard2 plays when hold mouse down on first child (the button) ? want storyboard2 start when mouse leaves control not when hold mouse down. second child (the image) not behavior , behaves way expect to.

in case need style of button wraps image here is:

<usercontrol.resources>      <style targettype="button" x:key="transparentbutton">         <setter property="template">             <setter.value>                 <controltemplate targettype="button">                     <border background="transparent">                         <contentpresenter/>                     </border>                 </controltemplate>             </setter.value>         </setter>     </style>  </usercontrol.resources>

solve preventing event tunnel adding event handler:

previewmousedown="button_previewmousedown"

then setting event.handled=true

in other words have:

xaml:

<button command="{binding additemcommand}"          previewmousedown="button_previewmousedown"          style="{staticresource transparentbutton}">     <image name="imgadd" source="/wpfapp1;component/add1.png"  /> </button>

code behind:

    private void button_previewmousedown(object sender, mousebuttoneventargs e)     {         e.handled = true; // privent event tunneling          // execute command associated button         ((button)sender).command.execute(sender);      }

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