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Practical Programming in Tcl & Tk, Third Edition by Brent B. Welch

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Obsolete Features

Several features that were replaced in previous versions are now completely unsupported.

The variable that contains the version number is tk_version. The ancient (version 1) tkVersion is no longer supported.

Button widgets no longer have activate and deactivate operations. Instead, configure their state attribute.

Menus no longer have enable and disable operations. Instead, configure their state attribute.

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