How to make WPF input control show virtual Keyboard when it got focus in touch screen

Try this,

First check for a physical keyboard presence:

KeyboardCapabilities keyboardCapabilities = new Windows.Devices.Input.KeyboardCapabilities();return  keyboardCapabilities.KeyboardPresent != 0 ? true : false;

If you do not find a physical keyboard, use the in-built virtual keyboard of windows:

Process.Start(Environment.GetFolderPath(Environment.SpecialFolder.System) + Path.DirectorySeparatorChar + "osk.exe");

Got help from here:link 1link 2

I've published a sample on how to trigger the touch keyboard in WPF applications when a user clicks into a Textbox, its here:

http://code.msdn.microsoft.com/Enabling-Windows-8-Touch-7fb4e6de

It has been something I've been working on for many months, i'm glad to finally contribute this example to our community. Please let me know if there are any questions, suggestions, problems, etc in the sample Q&A pane

I created a library to automate everything concerning TabTip integration in WPF app.

You can get it on nuget, and after that all you need is a simple config in your apps startup logic:

TabTipAutomation.BindTo<TextBox>();

You can bind TabTip automation logic to any UIElement. Virtual Keyboard will open when any element of specified type will get focus, and it will close when element will lose focus. Not only that, but TabTipAutomation will move UIElement (or Window) into view, so that TabTip will not block focused element.

For more info refer to the project site.