* @return returns true, if move was successfull
*/
private boolean movePage(MoveTreeNodeEvent event) {
CPManager cpMgm = CPManager.getInstance();
String movedNodeId = event.getNodeId();
cpMgm.moveElement(cp, movedNodeId, event.getNewParentNodeId(), event.getPosition());
cpMgm.writeToFile(cp);
selectTreeNodeById(movedNodeId);
return true;
}