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    <p>You could use a static you can read from and bind to, using the x:Static in your XAML. I do not like doing static global settings as it's more of an anti-pattern.</p> <p>I think you should look into inversion of control/dependency injection. There are many IoC containers out there, but I usually use Unity for my dependency injection. It's available at <a href="http://prism.codeplex.com" rel="nofollow noreferrer">http://prism.codeplex.com</a></p> <p>Using IoC, you could register you settings class, and within your VM that need the data, they can easily pull out the settings you want. Your code would look something similar to this (if using unity).</p> <pre><code>var vm = container.Resolve&lt;SomeViewModel&gt;(); public class SomeViewModel { public SomeViewModel(IUnityContainer container) { ISomeSettings settings = container.Resolve&lt;ISomeSettings&gt;(); } } </code></pre> <p><strong>EDIT: Or here is another solution you may be looking for:</strong></p> <p>Create your singleton:</p> <pre><code>class GlobalSettings : ViewModel { private Thickness m_globalGirth; private static GlobalSettings m_instance = new GlobalSettings(); public GlobalSettings() { GlobalGirth = new Thickness(2, 2, 2, 2); } public Thickness GlobalGirth { get { return m_globalGirth; } set { m_globalGirth = value; InvokePropertyChanged("GlobalGirth"); } } public static GlobalSettings Instance { get { return m_instance; } set { m_instance = value; } } } </code></pre> <p>Then setup your bindings:</p> <pre><code>&lt;Window x:Class="WpfApplication3.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:WpfApplication3="clr-namespace:WpfApplication3" Title="Window1" Height="300" Width="300" MouseDoubleClick="Window_MouseDoubleClick"&gt; &lt;Window.Resources&gt; &lt;WpfApplication3:GlobalSettings x:Key="settings" /&gt; &lt;/Window.Resources&gt; &lt;Grid&gt; &lt;Border BorderThickness="{Binding Source={StaticResource settings}, Path=Instance.GlobalGirth}" BorderBrush="Black" Width="100" Height="100" /&gt; &lt;/Grid&gt; &lt;/Window&gt; </code></pre>
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    1. COThere problem here lies somewhere else. Those settings I mentioned above are global settings that I need in almoset all of my datatemplates that I write for a lot of different viewmodels. This data is not specific to those viewmodels. They are global settings. From the WPF point of view they are more like ressources. Only that they can change at runtime. For example whenever there are lines and borders to be drawing in ANY of my datatemplates its thickness must be GlobalStrokeWidth. How can I make this available to all datatemplates. No matter what viemodel this datatemplate is for.
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    2. COAdded another solution to my original answer.
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    3. COWill the border pick up changes at runtimne from the INotifyPropertyChanged of GlobalSettings?
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