Userform Textbox to activate checkbox when at bottom.

[ourgarden]

I have been trying to activate a checkbox allowing access to the additional disabled pages on a UserForm AFTER the user reads the scrolled contents in a TextBox. I can lay a scrollbar beside it and controll the scrollbar .min .max. Is there a way to link this with the TextBox LineCount or scroll of the Textbox?

Anyones help on this would be appreciated. I have searched many posts but none that will activate another after scrolling to bottom of a TexBbox.

John