How do I identify and display a single line in a multi-line plot?

I'm trying to pick out a single line in a multi-line plot. I can highlight a line and its corresponding legend item, but I'd also like to display the name of the line on the plot when the line is clicked. I've tried tooltips and the data cursor so far. Below is a simple test case:

    % code
  y = plot(1:0.5:3, rand(5,5));
n = length(1:0.5:3);
a = zeros(n,1);
for i = 1:n
    set(y(i), 'ButtonDownFcn', {@LineSelected, y});
    a(i,1) = i;
end
a = num2str(a);
legend(a)

    % code
function LineSelected(ObjectH, EventData, h)
    set(ObjectH, 'LineWidth', 2.5);
    set(h(h ~= ObjectH), 'LineWidth', 0.5);
end