Which special Creation, Crossover, and Mutation functions, does the integer programming GA use?

Hi,

As stated at the following link titled "Mixed Integer Programming"

"http://www.mathworks.com/help/gads/mixed-integer-optimization.html#bs1ofqn"

and several other genetic solver help links that "ga" overrides the

creation, crossover and mutation function (specified using gaoptimset) when

using integer programming, then which special functions does it explicitly

use? What are their names? So that I may be able to find and read them in

the toolbox!

                                OR

Does it still selects one of the functions defined under gaoptimset

subsections or uses some other special functions not specified under the

options of gaoptimset?

A little explanation of the special functions would be highly useful and appreciated.

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Finally, as contradictory to many other help pages; the following solution

with ID: 1-10PDHC ("http://www.mathworks.com/support/solutions/en/data/1-

10PDHC/") says that custom creation and mutation functions can be created

with integer programming! Is is true for MATLAB 2011b and later versions?

Thanks

Best wishes Syed Saud Naqvi