Scroll down in a textbox

[clonfsp]

I have a textbox which is inside the second tab of a tab container.
When I load the form, I load a file into that textbox. Is there any way to send the scrollbar at the bottom of the text box. I want to show only end part of the file.
I have tried this, but it does not work (maybe because is inside a tab container?):

Textbox1.SelectionStart = Textbox1.TextLength 
Textbox1.ScrollToCaret()

thanks