DesktopTextControl.Paste
From Xojo Documentation
Method
Pastes the styled or unstyled text on the Clipboard into the editing area at the insertion point, adding the text to the existing text.
Notes
When pasting into a DesktopTextArea, if the text is styled, the style information is preserved.
Example
This example pastes the contents of the Clipboard into TextArea2 at the insertion point.
TextArea2.Paste