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Methods on forms
- Generally, the guidelines for writing extensible methods also apply to form methods.
- Chain of Command (CoC) gives access to the form's non-private members, which are the same as the non-private members for classes.
- CoC is enabled for nested classes. Therefore, methods that are defined in various levels on the form are extensible.
Note
One limitation of methods on forms is that for form data source methods, only methods that the kernel defines are enabled for extensions. Methods defined on the form data source aren't extensible. This limitation will be addressed in an upcoming Platform Update.
Field groups
Consider using field groups whenever possible. By using field groups, independent software vendors (ISVs) can add their fields for free when they extend a field group.
Form controls
Moving form controls could potentially cause a break if you make the controls non-extensible by moving them.