@Override
protected Transferable createTransferable(JComponent c) {
processSelectedNodes((KongaTree) c);
if (users != null) {
draggedFlavor = TransferableUsers.FLAVOR;
return new TransferableUsers(users);
} else if (groups != null) {
draggedFlavor = TransferableGroups.FLAVOR;
return new TransferableGroups(groups);
} else if (groupMembers != null) {
draggedFlavor = TransferableGroupMembers.FLAVOR;