WPF

private void MenuItem_PreviewMouseDown(object sender, MouseButtonEventArgs e)
{
    if (listBoxFiles.Items.Count != 0)
    {
        Point point = PointToScreen(Mouse.GetPosition(this));
    }
}

private void listBoxFiles_PreviewMouseRightButtonDown(object sender, MouseButtonEventArgs e)
{

}

<ListBox.ContextMenu>
    <ContextMenu>
        <MenuItem Header="Delete"/>
    </ContextMenu>
</ListBox.ContextMenu>

<ListBox ItemsSource="{Binding Customers}"
            Grid.Row="0">

    <i:Interaction.Triggers>
        <i:EventTrigger EventName="ListBoxItem.MouseDoubleClick">
            <g:EventToCommand Command="{Binding ListItemDoubleClickCommandd}" PassEventArgsToCommand="True" />
        </i:EventTrigger>
    </i:Interaction.Triggers>

</ListBox>

private ICommand _ListItemDoubleClickCommand;
public ICommand ListItemDoubleClickCommandd
{
    get
    {
        if (_ListItemDoubleClickCommand == null)
        {
            _ListItemDoubleClickCommand = new RelayCommand(listDoubleClicked);
        }
        return _ListItemDoubleClickCommand;
    }
}

private void listDoubleClicked()
{
}

<Rectangle Fill="LightGray"
            Stroke="Black"
            Width="200"
            Height="100"
            Grid.Row="1">
    <i:Interaction.Triggers>
        <i:EventTrigger EventName="MouseEnter">
            <g:EventToCommand Command="{Binding RectangleMouseEnterCommand, Mode=OneWay}"
                                MustToggleIsEnabledValue="True" />
        </i:EventTrigger>
    </i:Interaction.Triggers>
</Rectangle>

private ICommand _RectangleMouseEnterCommand;
public ICommand RectangleMouseEnterCommand
{
    get
    {
        if (_RectangleMouseEnterCommand == null)
        {
            _RectangleMouseEnterCommand = new RelayCommand(rectangleMouseEnter);
        }
        return _RectangleMouseEnterCommand;
    }
}

private void rectangleMouseEnter()
{
    // This does get called
}