Question: Interactive Title

I created a interactice slider and graph (Parabolas_In_Vertex_.mw)and want to have a title to display the actual equation being graphed. plot(x^2,title="Graph of")where graph of is, I would like it to say "graph of ax^2. with a being the value of the slider. I have inserted a title and put the following code in, but it does not work:

display( [

'title' = typeset( "Graph of ", y = %Slider*x^2),
'titlefont' = ["Times New Roman", 'BOLD', 14]]
);

This was put in the edit click action of the title. Any help would be great. I have looked everywhere and can't seem to find the answer. I can send you my file if you would like to look at it.  

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