4.1 Tkinter 控件导览 31 Toplevel 32, Frame 33, Label 35, Button 36, Entry 37, Radiobutton 37, Checkbutton 38, Menu 39, Message 42, Text 43, Canvas 44, Scrollbar 45, Listbox 45, Scale 46 4.2 字体和颜色 47 字体描述符 47, X Window System 字体描述符 47, Colors 48, 设置应用程序范围的默认字体和颜色 49 4.3 Pmw Megawidget 导览 49 AboutDialog 50, Balloon 50, ButtonBox 51, ComboBox 52, ComboBoxDialog 53, Counter 54, CounterDialog 55, Dialog 56, EntryField 56, Group 57, LabeledWidget 58, MenuBar 59, MessageBar 59, MessageDialog 61, NoteBookR 61, NoteBookS 62, NoteBook 63, OptionMenu 64, PanedWidget 65, PromptDialog 66, RadioSelect 66, ScrolledCanvas 67, ScrolledField 68, ScrolledFrame 69, ScrolledListbox 70, ScrolledText 70, SelectionDialog 71, TextDialog 72, TimeCounter 73 4.4 创建新的 megawidget 73 megawidget 的描述 73, 选项 74, 创建 megawidget 类 74