Cannot select text to copy from output box

[regandono]

i try your calculator.py
but cannot select any text to copy from output box
looks is readonly
is there any parameter to enable selection for output box?
i try use read_only=False but still cannot select
scrolling only can using mouse as page up/down is not working

txtOutput = TextArea(
style="class:output-field",
# text=help_text,
multiline=True,
scrollbar=True,
line_numbers=True,
search_field=search_field,
read_only=False
)