Only inserting on keyboard/mouse event

Hi, I'm new to perl-tk, but I've managed to make a window with a text
area in the middle. I have also set up a different thread to insert
text into a text area whenever a specified event occurs (recieves data
from client). This is all working together nicely, except that for the
text to show up in the text area, the mouse needs to be moved in the
window, or a
button on the keyboard needs to be pressed. How do I just get it shown
when it's inserted, and not require the input event, or focus, on the window?

Thanks,
Simon

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