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    <p>In your view you can add a "Command" property in xaml and bind it to your ViewModel's command</p> <pre><code>Command="{Binding CustomerSelectedCommand}" </code></pre> <p>Parameters can be passed in multiple ways. Most of the time, I just have other items bound to my ViewModel and I can just use them directly. However there is also a property called CommandParameter, here's an example of specifying it in XAML.</p> <pre><code> CommandParameter="{Binding ElementName=txtPassword}" </code></pre> <p>then in my ViewModel the definition of my Command looks like this</p> <pre><code>private void UserLogonCommandExecute(object parameter) { ... var password_box = parameter as PasswordBox; ... } </code></pre> <p>It sounds like you already know how to set up a RelayCommand in your ViewModel so I won't go into that. I found <a href="http://windowsclient.net/learn/video.aspx?v=314683" rel="nofollow">How Do I: Build Data-driven WPF Application using the MVVM pattern</a> helpful when I was getting started. </p> <h1>Per Comment Request Command Property Example</h1> <p>I'm just going to grab some working code, here's how you add a Command property to a button in XAML. </p> <pre><code>&lt;Button Command="{Binding ConnectCommand}"&gt; //Your button content and closing &lt;/Button&gt; here </code></pre> <p>This assume you have set your DataContext to a ViewModel that has a Command called ConnectCommand. Here's an example for ConnectCommand. You'll need to replace the contents of ConnectCommandCanExecute and ConnectCommandExecute with whatever work you want done. </p> <pre><code>public ICommand ConnectCommand { get { if (_connectCommand == null) { _connectCommand = new RelayCommand(param =&gt; ConnectCommandExecute(), param =&gt; ConnectCommandCanExecute); } return _connectCommand; } } private bool ConnectCommandCanExecute { get { return !_instrumentModel.IsConnected; } } private void ConnectCommandExecute() { if (TcpSettingsChanged()) SaveTcpSettings(); _instrumentModel.Connect(_tcpData); } </code></pre> <h1>RelayClass</h1> <p>One part of making this simple is the RelayClass I have in one of my core library .dlls. I probably got this from one of the videos I watched. This can be cut and pasted in it's entirety, there is nothing here you need to customize, except you'll probably want to change the namespace this is in.</p> <pre><code>using System; using System.Diagnostics; using System.Windows.Input; namespace Syncor.MvvmLib { public class RelayCommand : ICommand { private readonly Action&lt;object&gt; _execute; private readonly Predicate&lt;object&gt; _canExecute; public event EventHandler CanExecuteChanged { add { CommandManager.RequerySuggested += value; } remove { CommandManager.RequerySuggested -= value; } } public RelayCommand(Action&lt;object&gt; execute) : this(execute, (Predicate&lt;object&gt;) null) { this._execute = execute; } public RelayCommand(Action&lt;object&gt; execute, Predicate&lt;object&gt; canExecute) { if (execute == null) throw new ArgumentNullException("execute"); this._execute = execute; this._canExecute = canExecute; } [DebuggerStepThrough] public bool CanExecute(object parameter) { if (this._canExecute != null) return this._canExecute(parameter); else return true; } public void Execute(object parameter) { this._execute(parameter); } } } </code></pre>
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    1. COThanks for the feedback, Tod ... but I really don't understand the answer. How do you "add a 'command' property in xaml"?
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    2. COI've added a complete example but I'm pretty sure this is all covered in the link to the video I gave you. Also I have a blog post http://goo.gl/UJmqG that has links to this and other sites I found helpful while learning WPF and MVVM.
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    3. COTod ... many many thanks. Sorry, I didn't realise you had posted this response - sorry for not responding sooner.
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