One way to do it is to attach a second mouse to your work station. Then you can test multitouch (resizing, rotating, etc.). I managed to do that years ago. You need appropriate drivers though. Please check the moultitouch project. I think I was using that or something similar.
You can find more suggestions in this SuperUser post. But I never tried them.
EDIT
After checking your comments I understand your issue better. Try this StackOverflow thread. It's discussing rerouting mouse into touch events. Check also Blake.NUI project - it improves WPF 4 to better handle touch interaction (among other things).
In the project you will find MouseTouchDevice
class that should help you converting mouse into touch events:
/// <summary>
/// Used to translate mouse events into touch events, enabling a unified
/// input processing pipeline.
/// </summary>
/// <remarks>This class originally comes from Blake.NUI - http://blakenui.codeplex.com</remarks>
public class MouseTouchDevice : TouchDevice, ITouchDevice
{
#region Class Members
private static MouseTouchDevice device;
public Point Position { get; set; }
#endregion
#region Public Static Methods
public static void RegisterEvents(FrameworkElement root)
{
root.PreviewMouseDown += MouseDown;
root.PreviewMouseMove += MouseMove;
root.PreviewMouseUp += MouseUp;
root.LostMouseCapture += LostMouseCapture;
root.MouseLeave += MouseLeave;
}
#endregion
#region Private Static Methods
private static void MouseDown(object sender, MouseButtonEventArgs e)
{
if (device != null &&
device.IsActive)
{
device.ReportUp();
device.Deactivate();
device = null;
}
device = new MouseTouchDevice(e.MouseDevice.GetHashCode());
device.SetActiveSource(e.MouseDevice.ActiveSource);
device.Position = e.GetPosition(null);
device.Activate();
device.ReportDown();
}
private static void MouseMove(object sender, MouseEventArgs e)
{
if (device != null &&
device.IsActive)
{
device.Position = e.GetPosition(null);
device.ReportMove();
}
}
private static void MouseUp(object sender, MouseButtonEventArgs e)
{
LostMouseCapture(sender, e);
}
static void LostMouseCapture(object sender, MouseEventArgs e)
{
if (device != null &&
device.IsActive)
{
device.Position = e.GetPosition(null);
device.ReportUp();
device.Deactivate();
device = null;
}
}
static void MouseLeave(object sender, MouseEventArgs e)
{
LostMouseCapture(sender, e);
}
#endregion
#region Constructors
public MouseTouchDevice(int deviceId) :
base(deviceId)
{
Position = new Point();
}
#endregion
#region Overridden methods
public override TouchPointCollection GetIntermediateTouchPoints(IInputElement relativeTo)
{
return new TouchPointCollection();
}
public override TouchPoint GetTouchPoint(IInputElement relativeTo)
{
Point point = Position;
if (relativeTo != null)
{
point = this.ActiveSource.RootVisual.TransformToDescendant((Visual)relativeTo).Transform(Position);
}
Rect rect = new Rect(point, new Size(1, 1));
return new TouchPoint(this, point, rect, TouchAction.Move);
}
#endregion
}