Shortcut only in some cases

Question

hi! I have 2 buttons (btnDelete and btnClear), which are activated when an item of a listview is selected. Each button has a quick access.
<Window.InputBindings>
<KeyBinding Command="{Binding DeleteCommand}" Modifiers="Control" Key="D"/>
<KeyBinding Command="{Binding ClearCommand}" Modifiers="Control" Key="C"/>
</Window.InputBindings>
What I need is that the command is activated only when the button is active and not always. You may do this with xalm? THX!

Answer 1

Ok, it looks like this is a bug in MvvmLight:
https://mvvmlight.codeplex.com/workitem/7659
Change the namespace of the RelayCommand class from GalaSoft.MvvmLight.Command to GalaSoft.MvvmLight.CommandWpf and it should work as expected:
using GalaSoft.MvvmLight.CommandWpf;
You may also call the DeleteCommand.RaiseCanExecuteChanged() method whenever you want the CanExecute method of the command to be called again.
Here is a complete example that works as expected:
ViewModel.cs:
using GalaSoft.MvvmLight;
using GalaSoft.MvvmLight.CommandWpf;
using System.Collections.ObjectModel;
namespace WpfApplication20
public class Article
public class ViewModel : ViewModelBase
public ViewModel() {
this.Articles = new ObservableCollection<Article>();
this.Articles.Add(new Article());
this.Articles.Add(new Article());
this.Articles.Add(new Article());
public ObservableCollection<Article> Articles {
get;
set;
private Article _selectedArticle;
public Article SelectedArticle {
get {
return _selectedArticle;
set {
_selectedArticle = value;
RaisePropertyChanged();
DeleteCommand.RaiseCanExecuteChanged();
public RelayCommand DeleteCommand {
get {
return new RelayCommand(Delete, () =>
return this.SelectedArticle != null;
private void Delete() {
Articles.Remove(_selectedArticle);
MainWindow.xaml:
<Window x:Class="WpfApplication20.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">
<StackPanel>
<Button Grid.Row="0" Grid.Column="1" Name="btnDelete"
BorderThickness="2"
Command="{Binding DeleteCommand}"
ToolTip="Delete (Ctrl + D)"
Margin="5">
<!-- NOTE that IsEnabled is removed -->
<StackPanel Orientation="Horizontal">
<!--<Image Source="Imagenes/Botones/Borrar.png" Margin="5,5,0,5" Height="32"/>-->
<Image Source="av1.png" Margin="5,5,0,5" Height="32"/>
<TextBlock VerticalAlignment="Center" Margin="5" FontWeight="Bold" Text="Delete"/>
</StackPanel>
</Button>
<ListView Name="lvl"
Margin="5"
Height="200"
ItemsSource="{Binding Articles}"
SelectedItem="{Binding SelectedArticle}"/>
</StackPanel>
</Window>
MainWindow.xaml.cs:
using System.Windows;
namespace WpfApplication20
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
public MainWindow() {
InitializeComponent();
this.DataContext = new ViewModel();
Once again, note that you must remove IsEnabled from the XAML markup.
Hope that helps.
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