MATLAB: How to place a dot on a greek letter in a datatip? (interpreter not working)

datacursormodedatatipgreek letterslatex interpreterMATLAB

I am trying to create a in a datatip, in a bar plot. However, everything works fine except the "\dot" command which is not recognized by the interpreter. Notice that the tick labels and the plain worked just fine. See the picture below. Adding the "$…$" or the double "$$…$$" doesn't solve the problem. So why is the "\dot" command not recognized by the latex interpreter in the datatip?
Here is a piece of code which reproduces the issue:
figure
bar(rand(3,3))
set(gca,'TickLabelInterpreter','latex',...
    'XTick',[1 2 3],...
    'XTickLabel',{'$C_{L\dot{\alpha}}$','$C_{L\alpha}$','$C_{L\dot{\alpha}}$'}); % This works fine
set(datacursormode,'updatefcn',@mydatatip)
function output_txt = mydatatip(~,event_obj)
% Display data cursor position in a data tip
% obj          Currently not used (replaced by ~)
% event_obj    Handle to event object
% output_txt   Data tip text, returned as a character vector or a cell array of character vectors
pos = event_obj.Position;
%********* Define the content of the data tip here *********%
tipname = {'$C_{L\dot{\alpha}}$','C_{L\alpha}','C_{L\dot{\alpha}}'}; % Adding $$ doens't help (the first and last label)
% Display the y value:
output_txt = {[tipname{round(pos(1))},formatValue(pos(2),event_obj)]};
%***********************************************************%
    function formattedValue = formatValue(value,event_obj)
        % If you do not want TeX formatting in the data tip, uncomment the line below.
        % event_obj.Interpreter = 'none';
        if strcmpi(event_obj.Interpreter,'latex')
            valueFormat = ' \color[rgb]{0 0.5 1}\bf';
            removeValueFormat = '\color[rgb]{.15 .15 .15}\rm';
        else
            valueFormat = ': ';
            removeValueFormat = '';
        end
        formattedValue = [valueFormat num2str(value,4) removeValueFormat];
    end
end % End mydatatip
I have tried the solution posted here with no success:
how-to-properly-display-tex-strings-in-axes-datatips-matlab-hg2
and also this one from 2017, again with no success:
special-characters-in-datacursormode
Any help is appreciated!

Best Answer

The answer is to set the latex interpreter in 
set(datacursormode,'updatefcn',@mydatatip,'interpreter','latex')
and not in "mydatatip" function. The dollar signs $$ are needed, of course. Thank you Walter for the help!
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