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    copied!<p>In my test, its work is done well. Please refer to the following code, which probably helps with you.</p> <p>What this code do is, when `Jours.Count' equals to "3", the Window background gets red color. XAML:</p> <pre><code>&lt;Window x:Class="WpfApplication1.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="MainWindow" Height="350" Width="525"&gt; &lt;Window.Resources&gt; &lt;Style TargetType="Grid"&gt; &lt;Style.Triggers&gt; &lt;DataTrigger Binding="{Binding Jours.Count}" Value="3"&gt; &lt;Setter Property="Control.Background" Value="Red" /&gt; &lt;/DataTrigger&gt; &lt;/Style.Triggers&gt; &lt;/Style&gt; &lt;/Window.Resources&gt; &lt;Grid&gt; &lt;/Grid&gt; &lt;/Window&gt; </code></pre> <p>CodeBehind:</p> <pre><code>public partial class MainWindow : Window { public MainWindow() { InitializeComponent(); ITest test = new TestClass(); this.DataContext = test; } } interface ITest { ObservableCollection&lt;KeyValuePair&lt;DateTime, DateTime&gt;&gt; Jours { get; set; } } class TestClass : ITest { public TestClass() { Jours = new ObservableCollection&lt;KeyValuePair&lt;DateTime, DateTime&gt;&gt;(); Jours.Add(new KeyValuePair&lt;DateTime, DateTime&gt;(DateTime.Now, DateTime.Now)); Jours.Add(new KeyValuePair&lt;DateTime, DateTime&gt;(DateTime.Now, DateTime.Now)); Jours.Add(new KeyValuePair&lt;DateTime, DateTime&gt;(DateTime.Now, DateTime.Now)); } public ObservableCollection&lt;KeyValuePair&lt;DateTime, DateTime&gt;&gt; Jours { get; set; } } </code></pre>
 

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