Using \onslide in Tikz and pgfplots

Question

I am having trouble with using beamer's \onslide in TikZ and pgfplots. The issue I have encountered is that if I use \onslide then the specific parts of the picture I want to appear on a specific slide appear on all the slides in the frame.

Using \only works (I do not obtain the same error). However, I want to use \onslide because then the figure takes up the same space all the time.

The following example demonstrates my problem. It should run as follows: There is a curve and an x-axis (slide 1). Then a second curve is added (slide 2). Then the y-axis is added (slide 3). Then some text is added (slide 4). However, the picture on slide 1 when I run this is how it should look at slide 3. Having given this a lot of thought and google-powered effort, I have no idea what the issue could possibly be! (This tex.SE question is relevant, but does not really resolve the issue, or tell me the underlying issue (which I would be interested to know).)

\documentclass{beamer} 

\usepackage{tikz}
\usepackage{pgfplots}

%%%

\begin{document}

\begin{frame}
\frametitle{A frame}

\begin{figure}
\centering
\begin{tikzpicture}
\begin{axis}[
        every axis plot post/.append style={mark=none,domain=-3:3,samples=50,smooth},
        clip=false,
        axis y line=none,
        axis x line*=bottom,
        ymin=0,
        xtick=\empty,
]
\onslide<1->{%on all slides. Note: Changing this to \onslide<2-> does not change anything - all parts of the image occur on all slides.
    \addplot {x^2};
}
\onslide<2->{%on the 2nd slide and those coming after
    \addplot {x^2+1};
}
\onslide<3->{%on the 3rd slide and those coming after
    \draw (axis description cs:0.5,0) -- (axis description cs:0.5,1);
}
\end{axis}
\end{tikzpicture}\end{figure}

\onslide<4->{%on the 4th slide and those coming after
Slide 4.
}
%
\end{frame}
%
\end{document}

Note: In reality, I want to do this in a minipage. So if you provide an alternative method then you might want to bear this in mind. Or not.

Thanks in advance!

related: http://tex.stackexchange.com/questions/6632/is-it-possible-to-create-overlays-in-beamer-inside-pgfplots-graphics — jub0bs, Jan 14 '14 at 15:31
Also relevant is the second part of the answer to Beamer: column alignment with tikzpicture inside. — Claudio Fiandrino, Jan 14 '14 at 15:33
@Jubobs Yeah, that is what I was looking for (although it says that the problem is unsolvable...boo!). I had only just realised that the issue was definately with pgfplots when you commented! — user1729, Jan 14 '14 at 15:34
@ClaudioFiandrino Ah, right, yes, that works for the addplots. However, it seems not to work for the \draw. — user1729, Jan 14 '14 at 15:39
@user1729: you have to use \draw[visible on=<>].... I'm pretty sure it works too ;) — Claudio Fiandrino, Jan 14 '14 at 15:46
@ClaudioFiandrino That was my guess, but I got the following error. ! Package pgfkeys Error: I do not know the key '/tikz/visible on' and I am going to ignore it. Perhaps you misspelled it. — user1729, Jan 14 '14 at 15:53
I think you have to define visible on manually. For example, see here. — user1729, Jan 14 '14 at 15:58
Did you add the definition of the style? Take as a reference: Mindmap tikzpicture in beamer (reveal step by step) — Claudio Fiandrino, Jan 14 '14 at 15:58
@ClaudioFiandrino Yeah, I found that reference (and posted a comment about it seconds before yours!). Thanks for your help - it all works fine now. — user1729, Jan 14 '14 at 17:07
@ClaudioFiandrino Do you want to answer this one, or could it be closed as a duplicate? — Torbjørn T., Mar 14 '14 at 20:16

Using \onslide in Tikz and pgfplots

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