Release 10.1A: OpenEdge Development:
Progress Dynamics Web Development Guide

> ## Customizing with JavaScript

> You can customize the Progress Dynamics DHTML framework by extending existing objects (see the "Extending existing JavaScript object types" section) and by creating your own client-side actions (see the "Adding your own functions" section).

> You can use some of the default `.js` files in install_dir`\tty\dynamics\ry\dhtml\` as templates for your customizations. However, do not edit any of the default `.js` files. Upgrades to later releases of Progress Dynamics will overwrite these files. So, any changes you make will be lost after the upgrade. It is safer to copy the default file, rename it, and edit the copy.

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