Getting user input to initialize additional data series

[dhunnewell]

I am new to Ninja Trader and I am writing scripts for someone else, I have written a script that adds a data series to a chart... I want to get user input for The script initialize to use as the time base for the new data series... I am lost and cannot find anything script reference.

This is the initialize of my script:

 
protected override void Initialize()
{
Add(PeriodType.Minute, 600); 
CalculateOnBarClose = false;
}

I want to get user input for "period".

Is it possible to get user input?