CrossAbove Problem

[TrendTracker]

I am trying to modify the Stochastics to plot a dot whenever %K crosses above a value of 80 or below a value of 20. I keep getting errors with my syntax and I can't figure out why. The code below:

if (CrossAbove(Stochastics(7,14,3).K[0],80,1)) DrawDot("Dwn Dot", false, 0, Stochastics(7,14,3).K[0], Color.Maroon);

gives me errors of:

"The best overloaded method match for 'NinjaTrader.Indicator.IndicatorBase.CrossAbove(do uble,NinjaTrader.Data.IDataSeries,int)' has some invalid arguments"
and
"Argument '2': cannot convert from 'int' to 'NinjaTrader.Data.IDataSeries'"

I've also tried the following and got the same results.

double value20=Stochastics(7,14,3).K[0];
if (CrossAbove(value20,80,1)) DrawDot("Dwn Dot", false, 0, value20, Color.Maroon);

Can anyone kindly help me out here?

Thanks in advance.