I have a

javafx.scene.control.TreeView

and i want to add some new

javafx.scene.control.TreeItem<custom data class>

objects to a node when something is clicked... but i'm having trouble working out how to do this some JavaFX answers seem to suggest

myTreeView.children.addAll

but this is private? also tried

myTreeView.edit( new object )

but that didn't seem to do anything (need to force repopulate?) this is more of a JavaFX question in fairness but i'm taking inspiration from https://github.com/edvin/tornadofx-samples/blob/master/treeviews/src/main/kotlin/no/tornado/fxsample/treeviews/DemoTreeViews.kt