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GlazedTableModel does not offer that feature, so there no way to "enable" it.
As for your second question, what is it that you're trying to do when you ask "is it possible to get the current row position out of the row object, or is their another way?" Also, what context are you in? Various callbacks will have access to a row indicator (such as a selection change event).
I trying ti implement on a view a Jtable with filtering functionality using glazed list, everything works fine but only thing is missing is the row index for each row, is their no possibilty to add it to the model, or can I use another model?
Sorry, but GlazedTableModel just isn't designed to provide that. As for using another model, none of the other models work with glazed event lists.
You could look at extending GlazedTableModel and adding that functionality. If there are limitations on the class (like method visibility) that make this difficult, file a JIRA issue and I'll look at opening it up.