The Eyeshot WPF control, in order to manage multitouch in an efficient way, uses multitouch input as WM_TOUCH window messages instead of touch input via the tablet platform.
As a result, if you need to add it dynamically in your application, you have to use this code in your main window constructor:
public MainWindow()
{
InitializeComponent();
ViewportLayout.DisableWpfTabletSupport(); // available since build 11.0.456
}
You can test it with the attached source code sample.
If you need to restore the multitouch functionality on the other WPF controls, please have a look at this article.
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