How to set Selected Value in InputSelect

Hi,
I have implemented InputSelect component from the BC4J, and the items(attributes) are retrieved and updated to the table correctly. However,there's an additional item, "None" appeared in the menu-list. I didn't insert any item of the value of "None". I referred back the sample of InputSelect in the Edit Record sample code, the list of items inside the menu are all from the table and there wasn't any item named "None". So, can anyone please tell me where did this "None" come from?
Secondly, i would like to know how to make an item selected in a menu, so that it would be my initial value for the particular column?
T.I.A,
Sin Leng

The 'none' option is automatically added when the database column accepts NULL as a value.

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