Spark RichEditableText: Add line number in the front of each line

hi, dear

i trying customize spark textarea syntax highlight editor

now want add line number in front of each line.

something like:

#001 lorem ipsurr dolor sit amet,consecte adipiscing elit.

#002 praesentporttitor dolor et mauris blanceitin mperdiet nunc ultricies.

#003 ivamus scelerisque puruseget nibh mattis ac tincidunt magna bibendum. sed

so planning following:

first, set text padding left , linebreak

textarea.textdisplay.setstyle( "paddingleft", 30);
textarea.textdisplay.setstyle( "linebreak", linebreak.explicit);

then, wanna draw line number background of richeditabletext

i find 1 way "textareaskin(textarea.skin).background.fill = xxxx;"

but found background fixed, mean if move vertical scrollbar, background fixed there.

so, how draw background richeditabletext , background scroll text. not fixed.

any suggestion welcome

thank you

btw, need implement feature, "lines in alternate color", think related same question.

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