How can I return simulink memory back to OS?

It looks like simulink memory leak. Look following script. (comment memory value from Windows Task Manager)

%matlab start
% 227MB

open_system sf_car
% 358MB

sim sf_car
% 383MB

close_system sf_car
% 386MB

bdclose all
% 386MB

clear
clear all
clear functions
clear classes
clear java
clear global
clear import
clear variables
% 385MB

Even after closing simulink, memory used by MATLAB.exe wasn't decreased. And, when execute simulation, memory was increased slowly.

open_system sf_car
% 355MB

sim sf_car
% 381MB

for i = 1 : 200
sim sf_car
end
% 384

for i = 1 : 200
sim sf_car
end
% 386MB

for i = 1 : 400
sim sf_car
end
% 387MB

I want to return memory increased during simuation back to OS. I tried following command. But It didn't work.

close_system sf_car
close('all', 'hidden');
% 386MB

clear
clear all
clear functions
clear classes
clear java
clear mex
clear global
clear import
clear variables
% 385MB

[m x j] = inmem('-completenames')
for i = 1 : length(m)
if mislocked(m{i})
munlock(m{i})
end
end
clear functions
% 371MB
% decreased a little.. but, after munlock and clear command, 
% error message(?) printed during simulation =>
%Error calling slsfnagctlr('NagToken',...)
%A viewer named "DAS" already exists.
%Error calling slsfnagctlr('Clear',...)
%A viewer named "DAS" already exists.

[Kaustubha Govind]

Kyungjoon: I would recommend reporting this to MathWorks Tech Support so the appropriate development team can look into this.

[K E]

If you figure out the answer from Tech Support could you post it here? Am curious.