About command buttons 
A command button lets users execute a FirstClass command by clicking a button. 
Command button when drawn: 
Command button when complete: 
 
  
Adding command buttons 
1       Choose Fields > Buttons & Groups > Command Button. 
2       Add this field to the form. 
3       Update the following fields on the Contents tab of the Field Attributes form as required: 
 
Text  | 
The button name.  | 
 
Cmd  | 
The command to be executed, and the command number associated with it. Choose a command from the dropdown list or enter the appropriate command number in the following field.  | 
 
Icon ID  | 
The resource ID of an icon, if you want to add an icon to the left of the button text. If you deepen a button containing both text and an icon, the text moves below the icon.  | 
 
Default button  | 
Makes this button the default action when the user presses Enter/Return. Selecting this turns on the "Border" attribute.  | 
 
Display text  | 
Allows users to display icons and text on FirstClass client toolbar buttons.   This field is only displayed for command buttons on toolbar forms. | 
 
Auto repeat  | 
Makes the button behave as if repeatedly pressed when it is held down.  | 
 
  
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