How do I focus to last line with textbox?

im making with another device doing "sending txt as [char array]", have to receive txt as char each and merging into string.
for example, if the device is going to send string "Hello world", then i receive ["H"]["e"]["l"]["l"]["o"][" "]["w"]["o"]["r"]["l"]["d"] each. and need to merge it.
whatever, so if try to i merge it each time to textbox, the textbox cursor(?) is focusing the first line always really fast even i cant scroll down of multi-line. i want to change it to focusing the last line always even if several multi-line are over the window.
*like Command Prompt of windows. *

can i make it with basic components?

Use the Textbox extension by Taifun


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