[Gtk-sharp-list] Making TextView implement CellEditable

[Pedro Castro]

I've extended the TextView class in a class that also implements the
CellEditable interface. I then return this class in the StartEditing method
of a custom cell renderer.

However, compile goes well but at runtime my class isn't recognized as a
CellEditable. The error message:

Gtk-CRITICAL **: gtk_tree_view_column_cell_process_action: assertion
`GTK_IS_CELL_EDITABLE (*editable_widget)' failed


How can i make a custom class be detected as a CellEditable?

--
Pedro Castro
http://mega.ist.utl.pt/~prmc
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