lambda callback handlers deferring calls with lambdas and object references callback scope issues bound method callback handlers callable class object callback handlers other tkinter callback protocols binding events adding multiple widgets widget resizing revisitedclipping attaching widgets to frames layoutpacking order and side attachments the packer' expand and fill revisited using anchor to position instead of stretch customizing widgets with classes standardizing behavior and appearance reusable gui components with classes attaching class components extending class components standalone container classes the end of the tutorial python/tkinter for tcl/tk converts tkinter tourpart "widgets and gadgets and guisoh my!this topics configuring widget appearance top-level windows toplevel and tk widgets top-level window protocols dialogs standard (commondialogs the old-style dialog module custom dialogs binding events other bind events message and entry message entry laying out input forms tkinter "variablesand form layout alternatives checkbuttonradiobuttonand scale checkbuttons table of contents