Vista - DoubleClik event implemenattion

Hi all,

I have implemented my own DoubleClick Event for some FrameworkElements like
Viewport3D or some of the panels, because only controls implement
DoubleClickEvent. I made it on this way:

constructor code:

this.MouseDown += new MouseButtonEventHandle(CustomViewPort3D_MouseDown);
_clickTimeSpan =
TimeSpan.FromMilliseconds((double)System.Windows.Forms.SystemInformation.DoubleClickTime);
_prevClickTimeStamp = DateTime.Now;

declarations:

public event System.Windows.Input.MouseEventHandler MouseDoubleClick;
private TimeSpan _clickTimeSpan;
private DateTime _prevClickTimeStamp;

MouseDownHandler:

void CustomViewPort3D_MouseDown(object sender, MouseButtonEventArgs e)
{
TimeSpan timeSpan = TimeSpan.FromTicks(DateTime.Now.Ticks -
_prevClickTimeStamp.Ticks);
if (timeSpan > _clickTimeSpan)
_prevClickTimeStamp = DateTime.Now;
else
{
//fire event
if (MouseDoubleClick != null) MouseDoubleClick(sender, e);
}
}

For time between both clicks i used "SystemInformation.DoubleClickTime"
property from windows.forms. Do anybody know where to find this property in
wpf, I couldn't find it?
Or can anybody suggest any more simple solutions for doubleclick on
FrameWorkElements?

thanks