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    <p>I have reproduced your problem. But everything works fine.</p> <p>The problem may be that the <code>GroupName</code> property of the radio button is not defined. Give a same name for the GroupName of the two radio buttons.</p> <p>Ex:</p> <pre><code>&lt;RadioButton Content="No" GroupName="group1" /&gt; &lt;RadioButton Content="Yes" GroupName="group1" /&gt; </code></pre> <p>This is my full XAML:</p> <pre><code>&lt;Window x:Class="RadioButtonFocus.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity" Title="MainWindow" Height="350" Width="525"&gt; &lt;Grid Name="mainGrid"&gt; &lt;StackPanel Orientation="Horizontal"&gt; &lt;RadioButton Content="No" GroupName="group1" IsChecked="{Binding IsNoChecked}"&gt; &lt;i:Interaction.Triggers&gt; &lt;i:EventTrigger EventName="MouseEnter"&gt; &lt;i:InvokeCommandAction Command="{Binding CheckNoCommand}" /&gt; &lt;/i:EventTrigger&gt; &lt;/i:Interaction.Triggers&gt; &lt;/RadioButton&gt; &lt;RadioButton Content="Yes" GroupName="group1" IsChecked="{Binding IsYesChecked}"&gt; &lt;i:Interaction.Triggers&gt; &lt;i:EventTrigger EventName="MouseEnter"&gt; &lt;i:InvokeCommandAction Command="{Binding CheckYesCommand}" /&gt; &lt;/i:EventTrigger&gt; &lt;/i:Interaction.Triggers&gt; &lt;/RadioButton&gt; &lt;/StackPanel&gt; &lt;/Grid&gt; &lt;/Window&gt; </code></pre> <p>ViewModel</p> <pre class="lang-cs prettyprint-override"><code>public class MainViewModel : ViewModelBase { #region Declarations private bool isNoChecked; private bool isYesChecked; private ICommand checkNoCommand; private ICommand checkYesCommand; #endregion #region Properties /// &lt;summary&gt; /// Gets or sets a value indicating whether this instance is no checked. /// &lt;/summary&gt; /// &lt;value&gt; /// &lt;c&gt;true&lt;/c&gt; if this instance is no checked; otherwise, &lt;c&gt;false&lt;/c&gt;. /// &lt;/value&gt; public bool IsNoChecked { get { return isNoChecked; } set { isNoChecked = value; NotifyPropertyChanged("IsNoChecked"); } } /// &lt;summary&gt; /// Gets or sets a value indicating whether this instance is yes checked. /// &lt;/summary&gt; /// &lt;value&gt; /// &lt;c&gt;true&lt;/c&gt; if this instance is yes checked; otherwise, &lt;c&gt;false&lt;/c&gt;. /// &lt;/value&gt; public bool IsYesChecked { get { return isYesChecked; } set { isYesChecked = value; NotifyPropertyChanged("IsYesChecked"); } } #endregion #region Commands /// &lt;summary&gt; /// Gets the check no command. /// &lt;/summary&gt; /// &lt;value&gt;The check no command.&lt;/value&gt; public ICommand CheckNoCommand { get { if (checkNoCommand == null) { checkNoCommand = new RelayCommand(param =&gt; this.CheckNo(), null); } return checkNoCommand; } } /// &lt;summary&gt; /// Gets the check yes command. /// &lt;/summary&gt; /// &lt;value&gt;The check yes command.&lt;/value&gt; public ICommand CheckYesCommand { get { if (checkYesCommand == null) { checkYesCommand = new RelayCommand(param =&gt; this.CheckYes(), null); } return checkYesCommand; } } #endregion #region Private Methods /// &lt;summary&gt; /// Changes the checked. /// &lt;/summary&gt; private void CheckNo() { this.IsNoChecked = true; } /// &lt;summary&gt; /// Checks the yes. /// &lt;/summary&gt; private void CheckYes() { this.IsYesChecked = true; } #endregion } </code></pre> <p>NOTE: Here I have used Interactivity library. You have to install a redistributable to work this example. You can download it from <a href="http://www.microsoft.com/en-us/download/details.aspx?id=10801" rel="nofollow">here</a></p>
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    1. COThank you very much for this great answer!
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