javafx 8 - TreeView using Drag and Drop incorrect getGestureSource() -

i have simple tree view drag , drop enabled. but, on setondragover() call, receive event gesture source. source got not cell starts dragging (via setondragdetected() call), pane contains tree view. missing ?

my code shown below:

        tree.setcellfactory(         new callback<treeview<string>, treecell<string>>() {              @override             public treecell<string> call(                     final treeview<string> param) {                  treecell<string> treecell =                     new treecell<string>() {                      @override                     protected void updateitem(                             final string value,                             final boolean empty) {                          super.updateitem(value, empty);                          if (!empty && (value != null)) {                              settext(value);                             setgraphic(gettreeitem().getgraphic());                          } else {                              settext(null);                             setgraphic(null);                         }                     }                 };                  treecell.setondragdetected(event -> {                      dragboard dragboard =                         startdraganddrop(transfermode.move);                      clipboardcontent content = new clipboardcontent();                      content.putstring(treecell.gettreeitem().getvalue());                      dragboard.setcontent(content);                      event.consume();                 });                  treecell.setondragover(event -> {                      // here i've got pane instead of cell                     object source = event.getgesturesource();                      if ((event.getgesturesource() != treecell)                         && event.getdragboard().hasstring()) {                         event.accepttransfermodes(transfermode.move);                     }                      event.consume();                 });                  return treecell;             }         }); 

the gesture source node on startdraganddrop(...) called; calling on whatever node instance in (i guess have custom subclass of pane, or something).

so need

treecell.setondragdetected(event -> {      dragboard dragboard =         treecell.startdraganddrop(transfermode.move);      // ... });