- Then I miss an important design point. Why datasource returns Morph?

I do not get get why a data source should return UI element. To me it violates layers.

no, because that���s its purpose: to provide the table with the cell elements (which are by definition Morphs��� any kind of morphs). 

a TableDataSource is not a spec, is the provider of cells.

so maybe TableCellSource / TableCellProvider ?

I���m not against changing its name, in general the family of names are ���DataSource���, ���Store���, etc. so I imagine that ���Provider��� fits (even if I tend to hate names style ���Manager���, ���Factory���, ���Provider���, because there are too generic��� sometimes is that what you have :P)

But is not just a ���cell provider���, it does something more, is a general model of the TableMorph: it provides cells, headers and interaction capabilities (like drag&drop)��� so it is more like a "table data provider���, TableDataSource, TableStore, TableProvider are then better names, IMO��� 

this changes will impact Pharo 7��� is very good that we can have a discussion like this now, that we have the time to reach a consensus :)

Esteban

cheers -ben