Textbox Multiline

I have a form with a multiline textbox on it (visual Basic framework 4.6.1). When compiled for Civil3D, the textbox will accept the return key (go to the next line for text entry).
However, in the Bricscad environment, I can not add multiple lines of text in the textbox.
Same form, same references (for the forms) but fails.
Any ideas on why the BC environment will not allow multi line text entry in a textbox?

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