Echo Web Framework

All - I have a need to change the functionality of the EPNG combobox. Currently when you type into the combobox the list of options is narrowed down by things that start with whatever you type in. I want to be able to narrow the list down to any option that contains the text no matter where it is in the option value.

I've looked at the source for the ComboBox and it looks like all the option filtering is done in javascript on the client side. There are 3 methods that perform the matching; each of which tests to ensure that the option value starts with the test string. I want to know what the easiest way to override these 3 methods would be.

Thanks in advance for any pointers.
nortchuck