xaml - Trying to begin a storyboard on change of a property in WPF application -

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i have simple mvvm application. contains property, change true when method correctly executes, , false if now. when property changes, few seconds display "passed" or "failed" on status bar of wpf application , have fade away.

so have read stackoverflow, , googled intensely, no avail. think have misunderstood how need structure storyboard.

in statusbar have added storyboard, trying trigger in <usercontrol.resources> @ beginning of xaml file. correct ? @ moment using dummy values of 0/1, assume correct practice use booleantostring converter make, or perhaps there better way?

so status bar contains :

<statusbar >   <statusbar.resources>     <storyboard x:key="statusbar" >       <doubleanimationusingkeyframes                      storyboard.targetproperty="(uielement.opacity)"                      storyboard.targetname="statusbaritem">         <easingdoublekeyframe keytime="0" value="0"/>         <easingdoublekeyframe keytime="0:0:0.5" value="1"/>         <easingdoublekeyframe keytime="0:0:3" value="1"/>         <easingdoublekeyframe keytime="0:0:4" value="0"/>       </doubleanimationusingkeyframes>     </storyboard>   </statusbar.resources> </statusbar>

and trying register called in usercontrol.resources :

do have structure backwards ? not compile , error :

a value of type 'beginstoryboard' cannot added collection or dictionary of type 'setterbasecollection'.

any help, resources or information appreciated. lot.

here's example. need use trigger start storyboard.

<grid>     <grid.datacontext>         <wpfapplication1:mainviewmodel/>     </grid.datacontext>      <grid.resources>         <style x:key="statusstyle" targettype="statusbar">             <setter property="opacity" value="0"/>             <style.triggers>                 <datatrigger binding="{binding pulse}" value="true">                     <datatrigger.enteractions>                         <beginstoryboard>                             <storyboard>                                 <doubleanimationusingkeyframes                                      autoreverse="true"                                      storyboard.targetproperty="(uielement.opacity)" >                                     <easingdoublekeyframe keytime="0" value="0"/>                                     <easingdoublekeyframe keytime="0:0:0.5" value="1"/>                                     <easingdoublekeyframe keytime="0:0:3" value="1"/>                                     <easingdoublekeyframe keytime="0:0:4" value="0"/>                                 </doubleanimationusingkeyframes>                             </storyboard>                         </beginstoryboard>                     </datatrigger.enteractions>                 </datatrigger>             </style.triggers>         </style>     </grid.resources>     <grid.rowdefinitions>         <rowdefinition/>         <rowdefinition height="auto"/>     </grid.rowdefinitions>      <statusbar style="{staticresource statusstyle}"                         grid.row="1" itemssource="{binding items}" />     <checkbox content="checkbox" height="16"                        horizontalalignment="left" margin="41,30,0,0"                        ischecked="{binding pulse}" verticalalignment="top" /> </grid>

view model

public class mainviewmodel : viewmodelbase {     private bool _pulse;      public mainviewmodel()     {         items = new[] {"passed"};     }      public ilist<string> items { get; private set; }      public bool pulse     {         { return _pulse; }         set { set(()=>pulse, ref _pulse, value); }     } }

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