wpf-notifyicon/Hardcodet.NotifyIcon.Wpf/Source/Sample Project/Tutorials/01 - Declaration/NotifyIconResourceDictionary.xaml

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:tb="http://www.hardcodet.net/taskbar">

  <!-- Globally declared notify icon (ResourceDictionary is not in use, example only) -->
  <tb:TaskbarIcon x:Key="MyNotifyIcon"
                  IconSource="/Icons/Error.ico"
                  ToolTipText="hello world" />

</ResourceDictionary>