gtk-tree-store-append (store parent)

store -- a gtk-tree-store object
parent -- a valid gtk-tree-iter iterator, or nil

The gtk-tree-iter iterator of the appended row.

Appends a new row to the tree store. If parent is non-nil, then it will append the new row after the last child of parent, otherwise it will append a row to the toplevel. The row will be empty after this function is called. To fill in values, you need to call the functions gtk-tree-store-set or gtk-tree-store-set-value.