Before plotting the ButtonDownFcn works well but after plotting nothing happen.
So you did something like this?
ax = axes;
ax.ButtonDownFcn = @(varargin) disp('hi');
% Click on the axes, see that 'hi' is displayed
plot(ax, 1:10, 1:10);
% Click on the axes, nothing is displayed
If so that's correct. From the description of the NextPlot property for axes, "Properties to reset when adding a new plot to the axes, specified as one of these values:" The default behavior is "'replace' — Delete existing plots and reset axes properties, except Position and Units, to their default values before displaying the new plot."
You could use hold on before the plot call to not reset the axes ButtonDownFcn property or you could set the ButtonDownFcn of the axes after calling plot not before. Alternately depending on what you're plotting you may be able to call a lower-level plotting function (line instead of plot.)
But without turning the HitTest property for the line created by either plot or line to 'off' clicking exactly ON the line (or I think within a pixel or three of it) won't trigger the ButtonDownFcn function even if it is set.
Though with that picture, do you need to click on an axes? I'd consider making a 3-by-3 grid of buttons and giving each button an appropriate callback.
