Return Code	Significance
0	no error
1	zero pointer entry

The field buffer is a user-configurable memory of the field and is used to support programming. support programming. The field buffer can be used to pass for instance status- or other object-specific information, which are required as long as the field exists.

This function creates a copy of the passed string in the field buffer. The buffer can have any size and is empty after the button area has been created.