Matlab Simulink how to select elements by matlab script

Hello,

for code testing, I'd like to select elements of a matlab simulink model by matlab code.

I'd expect to get the (line) handle of the selected simulink item returned AFTER selecting the elements by script.

% * code to select constant1 block * 
handle_of_constant1 = find_system(bdroot,'FindAll','on','Selected','on');

Thank you in advance!