Creates a new TreeViewColumn and inserts it into the this
at position.
If position is -1, then the newly created column is inserted at the end. The column is initialized with the attributes
given. If this has “fixed_height” mode enabled, then the new column will have its sizing property
set to be GTK_TREE_VIEW_COLUMN_FIXED.
| this |
A TreeView |
| position |
The position to insert the new column in |
| title |
The title to set the header to |
| cell |
The CellRenderer |
| ... |
A null-terminated list of attributes |
|
The number of columns in this after insertion. |