initialized eventuality wpf usercontrol firing

i've got unequivocally rudimentary wpf usercontrol looks this:

namespace myusercontrol
{
  /// <summary>
  /// communication explanation usercontrol1.xaml
  /// </summary>
  open biased category usercontrol1 : usercontrol
  {
    open usercontrol1()
    {
      initializecomponent();
    }

    stable overrule vacant onrender(drawingcontext drawingcontext)
    {
      rect rect = new rect(rendersize);
      drawingcontext.drawrectangle(brushes.aliceblue, new pen(brushes.red, 1), rect);
      base.onrender(drawingcontext);
    }
  }
}

i following xaml customary wpf window this:

<window x:class="wpfapplication1.window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:mc="clr-namespace:myusercontrol;assembly=myusercontrol"
    title="window1" height="351" width="496">
    <grid>
    <mc:usercontrol1 margin="0,0,0,0" name="ucontrol1" initialized="ucontrol1_initialized"/>
  </grid>
</window>

with formula behind above wpf window looks this:

private vacant ucontrol1_initialized(object sender, eventargs e)
{
  messagebox.show("hello!");
}

unfortunately initialized eventuality never fired. anybody greatfully tell me why?

many thanks!