WPF

<Button Background="Transparent"
        BorderBrush="Transparent"
        Command="{Binding RunCommand}"
        Margin="2"
        Width="120"
        Height="40">
    <StackPanel Orientation="Horizontal">
        <Image Source="/DemoUI;component/Images/run.png"
                Height="32"
                Width="32"
                Margin="3"/>
        <TextBlock Text="Run Test"
                    VerticalAlignment="Center"/>
    </StackPanel>
</Button>

private ICommand _RunCommand;
public ICommand RunCommand
{
    get
    {
        if (_RunCommand == null)
        {
            _RunCommand = new RelayCommand(runTest, runTestCanExecute);
        }
        return _RunCommand;
    }
}

private void runTest()
{
    isTesting = true;

    var device = (from d in tempDevices
                    where d.DeviceId == SelectedDevice.DeviceId
                    select d).FirstOrDefault();

    diag.ExecuteTest(device, SelectedTest);
}
private bool runTestCanExecute()
{
    return !isTesting;
}