Simulink: Function Handles Not Supported!

I have a lengthy Matlab program, parts of which I'd like to embed into a Simulink program. In the Matlab program there are numerous functions that I call as part of "classes" that involve function handles. How can I use these in Simulink's Code Blocks? I keep getting the Simulink error "Function handles in structures are not supported", when I try to add even just the class declaration in a code block (class = someClass;)

As reference, here is an example of the main Matlab program; it calls various functions.

    % Main Matlab File:
    class = someClass;
    output1 = class.object1(input1);
    output2 = class.object2(input2);

And here is the file that holds these classes. In reality, each "class file" has dozens of functions (though I listed just two), so it would be cumbersome to break each function into a separate file.

% Filename: someClass.m
function out = someClass
    out.object1 = @object1;
    out.object2 = @object2;
...
end

function y = object1(...)
...
end

function y = object2(...)
...
end