Syntax
Def:ComboBox:%panel.%combobox(%width,%height) [*][*]
%panel specifies the name of the panel which contains that particular control. %combobox specifies the name of a combobox control. %width specifies the width of a control, where one is equal to one fifth of the average width of a character in the font being used. %height specifies the height of a control, where one is equal to one fifth of the height of a character in the font being used.
Example
Def:ComboBox:emacs.dialog.properties.major(120,50) [*][*]