Associate UDButton and UDTextBox

So I have a search page, which has a UDTextBox and UDButton. When I type in the text box, I would like to just press Enter, and the search begin (Enter “clicking” the button…). Unfortunately, I have to either tab and space-bar, or use the mouse…

Any ideas on binding these two together?

UD 3.1.1
PU 1.4.3