Want C# WPF program (source code) using Simulated Mouse Click / Virtual Mouse function control method to clicks on On-Screen Keyboard Keys.

Want C# WPF program virtual mouse functions (source code) simulated mouse movement / virtual mouse function control method to do mouse click on-screen keyboard keys. Example: In Windows 8.1 / 10, Have On-Screen keyboard is display on desktop view, and have C# WPF program XMAL have Up, Down, Left Right buttons, using virtual mouse / simulated mouse control function to moving mouse cursor position when user if decided move to virtual key "G" on the On-Screen Keybaord. And C# WPF program have Mouse Click buttons, like Mouse Left Click, Mouse Right Click ...etc. User click the "Mouse Left click" botton to make left click the virtual key "G" and XMAL Text field have display enter the "G" letter or an Open Notepad display letter "G". Noted where the program's challenge: When C# WPF program using virtual mouse call leftbuttonClick() method ...etc., virtual Mouse click simulation may working on most applications like notepad, but the virtual mouse click is not click on On-Screen Keyboard virtual keys. Want the C# WPF virtual mouse control function to clicks On-Screen Keyboard keys. Development platform: Visual Studio 2013 .NET Framework 4.5 Language: C# Application: WPF, Windows Presentation Foundation Windows 8.1, Windows 10 App development Required: Submit completed C# WPF source code program, And Need Sign an IP Agreement (Freelancer), Intellectual Property Transfer Agreement