Hi Max
In MATLAB GUI, a left mouse click triggers the execution of the listbox's Callback function and a right mouse click triggers ButtonDownFcn.
Therefore, if you would like to execute the same callback function from either the left or the right mouse button click, you may need to assign your function ClickToChose to both the 'ButtonDownFcn' and the 'calllback'.
That is to say, in the function ArithmeticalMeanButton_Callback, you may need to add the following line
set(Data,'callback',@ClickToChose);
More details of the ListBox component can be found here
A good example showing how to use ListBox can be seen via the following link
In addition, I have noiced that you use findobj to get the handle of 'PlotedShotsListBox'. Have you considered directly obtain that from handles structure? For example, you may change the line
Data = findobj('tag','PlotedShotsListbox');
to
Data = handles.PlotedShotsListbox;
This might be able to improve the efficiency of your code.
-Yu
