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MATLAB - how to use event.eventData, and efficiently
function updatePlot(obj, propNum)
    X = get(obj.LH(propNum), 'XData');
    Y = get(obj.LH(propNum), 'YData');

    X(end+1) = obj.(dynProps{propNum}).newestData(1);
    Y(end+1) = obj.(dynProps{propNum}).newestData(2);

    set(obj.LH(propNum), 'XData', X, 'YData', Y);
end

classdef MyClass < handle
  events
    % Event
    MyEvent
  end

  methods
    function obj = MyClass
      % Constructor
    end
  end
end

classdef MyEventData < event.EventData
  properties (Access = public)
    % Event data
    Data
  end

  methods
    function this = MyEventData(data)
      % Constructor
      this.Data = data;
    end
  end
end

X = 1:10;
Y = 1:10;
data = struct('XData', X, 'YData', Y);
eventData = MyEventData(data);

obj = MyClass;
l = addlistener(obj, 'MyEvent', @(evtSrc,evtData)disp(evtData.Data));
notify(obj, 'MyEvent', eventData)

>> notify(obj, 'MyEvent', eventData)
    XData: [1 2 3 4 5 6 7 8 9 10]
    YData: [1 2 3 4 5 6 7 8 9 10]