private void initSplitPane(){
        splitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, treeView, tableView);
        splitPane.setDividerLocation(WINDOW_SIZE.width/3);

        splitPane.setDividerSize(5);
        splitPane.setSize(WINDOW_SIZE.width-20, WINDOW_SIZE.height-75);
        splitPane.setLocation(5,45);
        add(splitPane);
    }