Change AmCharts line style

Question

I have a chart that shows the basic values ​​over time: http://codepen.io/anon/pen/ZGOaem

I want the chart line to change after today's date (you can see what I plan from 5 days ago to 5 days).

Basically, I need a line that becomes pale and dashed after today's date.

I am trying to achieve this with properties:

alphaField, negativeLineAlpha and dashLengthField

I don’t know where I am mistaken, I played with him all day: /