Set Text Box property to MultiLine

I am exercising some problems in 开发者_JS百科Expresion blend. My problem is with textbox property.I want it to show strings as multiline text, but it goes horizontally right and I should put cursor on string and go to right along with text.This is very annoying. Any suggestions?

Here a picture of it:

My best regards and thanks in advance.

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It looks like you need to use the TextWrapping property:

<TextBox TextWrapping="Wrap" />