Using self inside a Tableview callback

Hello, I have the folowing code (just wrote, might have coding problemas, but to explain the problem is ok):

t = { } function t:new()     local myobj = {}     myobj.exampleAttribute = 2     myobj.datatable = widget.newTableView{ ... onRowRender = renderRow}     setmetamodel(myobj, {\_\_index=t}) end function renderRow()     -- How to access exampleAttribute ?     -- I cannot access self here as it is not a metamethod      -- I can access t, but I'm working with metamodels, and wanted to use the "instance" return by new end

How to provide access to self as the callback is not a metamethod?