Hello leave the page thank you :handshake:
This Question is very simple to answer. Just use a Scroll Pane and a Element to group your Anchor-Panes, for example : ScrollPane with VBox as Grouping
Or you can also use Frameworks for this like :
http://fxexperience.com/controlsfx/
When I remember correctly, they designed a Pane which is automatically placing nodes like a Gallery. These nodes get moved when necessary.