Convert String to Float

Local MyString:String = "123.239"
Local Number:Float = 0

How can I convert the string above to a float variable. Using Casting I only get the numers before the point.

local number:float = float(mystring)

Local myStr:String="123.239"

Local num:Float

num=myStr.ToFloat()

Print num

thank you!

i think I really need a good documentation for blitzmax :-)