How to get notification on when richedit control has maximum text length

I want to increment the height of my edit control when size of string in richedit control gets maximum means to its width. I have used EN_M开发者_开发问答axText but it is not working in RichEdit control.

You can use OnChange event and check the length. If it is reached you can do whatever you want, like use a MessageBox notifying the user.