Video Tutorial ArcGIS : Customize Dialog Box
ArcMap and ArcCatalog can be customized without writing a single line of code. Create, add, move, and remove toolbars and commands, and even add tools that others have created using the Customize dialog box. To activate the Customize dialog box, choose Tools > Customize on the standard menu. The Customize dialog box has Toolbars, Commands, and Options tabs. The Toolbars and Commands tabs are used to modify the user interface, while the Options tab provides control over basic customization settings.
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