Each pane we have created using the add method is essentially a frame widget. After we have created the panes, we can put widgets inside them. As shown inside program 2-5, we can use the subwidget method to find out the name of the pane subwidgets. Then we can just create new widgets as their children and pack these new widgets inside the panes. The output of program 2-5 is shown in figure 2-6
