Error: add_plot_element not defined

[abysmon]

I've got Julia 3.5 and Gadfly latest one. Tried running a sample code, but got stuck with add_plot_element not defined error message. I've tried Pkg.update() multiple times. Running on Win8 64bit. Maybe something is missing ? Below is the code I've tried running.
Edit: I'm using Juno as IDE.

using Gadfly
# gadfly sample
xs = [0:0.1:pi]
k = layer(x=xs, y=sin(xs))
add_plot_element(k, Guide.title("Now it has a title"))
p = plot(x=xs, y=sin(xs))
add_plot_element(p, Guide.title("Titular"))
add_plot_element(p, Guide.title("Now it has a title"))
display(p)

[Mattriks]

This can be closed, since push! is documented