passing a color value to tint, hls.. etc. [SOLVED]

I do not find the way to pass color effect parameter to object that have "Tint" effect and similars:

this is because the effect parameter does not allow a string:

also tried with rgb,rgbEX etc.

where should I post a bug/improvements?

thanks in advance

Try rgbEx255(7,54,135)

without quotation marks.