Defines the command executed when a button is pressed.
DefButton [/immediate] [/comgroup <command-group>] <button-name> <command> [<upCommand>] [/menu <menu-item-title>] [/features <features-required-for-menu-item>]
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                             /comgroup  | 
                        
                             This can be used with the function GetLastCommand . GetLastCommand returns the text of the most recent command executed which specifed the supplied command group value. The command DefMenu also uses this feature.  | 
                    
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                             /immediate  | 
                        
                             If specified, the command will be enabled for immediate execution. That is the command will be executed immediately even if another command - such as a simulation run - is currently in progress. This will only be accepted when the command specified is one of a small number of built-in command enabled for immediate execution. For the list of commands, see the command DefMenu . You may not call a script if immediate execution is specified.  | 
                    
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                             /menu  | 
                        
                             Flags whether this entry is a submenu of the button.  | 
                    
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                             button-name  | 
                        
                             Name of button. Either a pre-defined button as listed in the command DefineToolBar or a new button created with CreateToolButton .  | 
                    
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                             command  | 
                        
                             Command to be executed when the button is pressed. If /immediate is not specified this may be any valid command including a script.  | 
                    
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                             up-command  | 
                        
                             Command to be executed when a toggle button is released. The button must be defined to have a toggle action using the /toggle switch for the command CreateToolButton .  | 
                    
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| ◄ DecompressXML | DefineToolBar ▶ | |