In the kivy doc there is the function add_widget(widget, index=0, canvas=None)
and we must be able to set an index to position the widget.
index: int, defaults to 0
Index to insert the widget in the list. Notice that the default of 0 means the widget is inserted at the beginning of the list and will thus appear under the other widgets. For a full discussion on the index and widget hierarchy, please see the Widgets Programming Guide.
So first either index I try nothing change on the widget order. And then i would like to insert my widget at the end of the list and not at the beginning.
If you have some idea :)