Edit Multple lines

Topics: Developer Forum
Aug 26, 2013 at 3:21 PM
Hello there guys, I'm currently building a text editor for my work and I would like to know if there's a simple way to make the editor Edit multiple lines at the same time (Alt + UP or Down). The cursor select these lines but as soon as I type, it goes to the original line. Is there any property I have to set true to edit multiple lines? Sorry if there's is one, I was looking for it, but never found it.