command history with updates

I wote this function, which works, but the history is not updated until Mtalb is relaunched. So this is part answer and part question. If anyone knows how to get Matalb to reload the history file without relaunching, I would love to know. Here is my function:

function append_history(cmd, exec_time)
    % exec_time is in microseconds
    % tic; <command>; exec_time = round(toc * 1e6);
    hist_path = fullfile(prefdir,'History.xml');
    if (exist(hist_path,'file'))
        % read history file
        txt = fileread(hist_path);
        % condition cmd
        if (isstring(cmd))
            cmd = char(cmd);
        end
        len = length(cmd);
        if (cmd(len) ~= ';')
            cmd(len + 1) = ';';
        end
        % build xml history entry
        xml_cmd = ['<command execution_time=' '"' num2str(exec_time) '">' cmd '</command>' newline];
        new_txt = insertBefore(txt, '</session>', xml_cmd);
        % write out file
        fp = fopen(hist_path, 'w');
        fwrite(fp, new_txt, 'char');
        fclose(fp);
    else
        beep
        fprintf(2, 'File not found: ''History.xml''\n');
        disp('Cannot update history.');
        return
    end
end

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command history with updates

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command history with updates

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