G-Bollinger bands volatility breakout v.1

This is my frist publish scrpit. I developed this indicator origin is BB. It make from easy idea but powerful for sideway to breakout

1. I findout volatility by upper band of BB - lower band of BB (I called "Aline")
2. I created SMA of Aline (I called Bline)
3. I created the special line is "Cline" from Aline - Bline
4. I created 0 line " Baseline "

G-BBvB is the very good indicator to detect low volatility to begin the volatility = Buy signal

Now I can't find the sell signal form indicator. I try backtest sell at Cline cross zeroline but it not work.

I'll develop "G" indicator for free .

Goodluck :D