coltype data dictionary

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Hi all.
How can I customize the values to display into coltype attribute?
I'm studing the ColumnTypeAttributeEditor class and
I notice that in the constructor at the line:
...
dd = WMSession.getWMSession().getDataDictionary(wmAttribute.getDataDictionaryID());
...

it finds out all the values of the data dictionary.

I would like to filter this values and to display only that ones that follow certain constraints.
Is it possible? :confused:

Can you tell me if Is there some documentation about java customization of Model Manager?
I would like, for example, to understand the com.osm.biz.PDM class ... :rolleyes: and so on ...:rolleyes:

Thanks all in advanced,
:) Nadia