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copied!<p>Why dont you use the Command Property of the Button instead of the events? </p> <p>The Command is triggerd by mouse click or enter key.</p> <p><a href="http://msdn.microsoft.com/en-us/library/ms752308.aspx" rel="nofollow">Commanding Overview</a></p> <p><a href="http://msdn.microsoft.com/en-us/library/system.windows.input.commandbinding.aspx" rel="nofollow">CommandBinding</a></p> <p>Xaml:</p> <pre><code> <Grid> <Grid.RowDefinitions> <RowDefinition /> <RowDefinition /> </Grid.RowDefinitions> <Button Grid.Row="0" Command="{Binding CalculationCommand}" Content=" Calculate" /> <Label Grid.Row="1" Content="{Binding StateText}" /> </Grid> </code></pre> <p>ViewModel:</p> <pre><code>public class ViewModel : INotifyPropertyChanged { private string _stateText; public RelayCommand CalculationCommand { get; set; } public string StateText { get { return _stateText; } set { _stateText = value; OnPropertyChanged("StateText");} } public ViewModel() { CalculationCommand = new RelayCommand(OnCalculate); StateText = string.Empty; } private void OnCalculate(object obj) { StateText = "Please wait, calculating."; var context = TaskScheduler.Current; Task.Factory.StartNew(() =>{ //Calculating Logic goes here }).ContinueWith(x => { StateText = "Done."; },context); } public event PropertyChangedEventHandler PropertyChanged; protected virtual void OnPropertyChanged(string propertyName) { PropertyChangedEventHandler handler = PropertyChanged; if (handler != null) handler(this, new PropertyChangedEventArgs(propertyName)); } } </code></pre> <p>I am using the RelayCommand from Josh Smith <a href="http://msdn.microsoft.com/en-us/magazine/dd419663.aspx" rel="nofollow">article</a> </p>

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