gtk:flow-box-insert (flowbox child position)

flowbox -- a gtk:flow-box widget
child -- a gtk:widget child widget to add
position -- an integer for the position to insert the child widget in

Inserts the child widget into the flow box at a given position. If a sort function is set, the widget will actually be inserted at the calculated position.

If the position argument is -1, or larger than the total number of children in the flow box, then the child widget will be appended to the end.