[ Version ( since = "3.12" ) ]
public void insert (Widget widget, int position)
Inserts the widget into this at position.
If a sort function is set, the widget will actually be inserted at the calculated position and this function has the same effect as add.
If position is -1, or larger than the total number of children in the this, then the
widget will be appended to the end.
| this |
a FlowBox |
| widget |
the Widget to add |
| position |
the position to insert |