This article will give you getting started experience with RadVirtualKeyboard which is used for the user's input in a RadTextBox.
To start using RadVirtualKeyboard just drag it from the toolbox and drop it onto the form:
Drag a RadTextBox from the toolbox and drop it onto the form. Then, set its Multiline property to true. Adjust the Size according to your design for the input box:
Now, you are ready to start typing in the input box by using the keyboard: