Delphi4 developer's guide
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1 lists the default pages and the kinds of components they contain. 0 projects. Also, the box components on this page are useful for building custom dialog boxes that will look compatible with 32-bit dialog boxes. Samples Sample custom components, including gauge, color grid, spin buttons, directory outline, calendar grid, IBEvent Alerter ActiveX Sample ActiveX controls MIDAS Midas components used for creating multi-tiered database applications (not available in all versions) For information on each component you see on the default palette, see online Help: on the Contents page of Help, choose Using Delphi|Basic Skills|Working with components|About the Component palette.
For a discussion of implementing owner-draw controls in your application, see “Adding graphics to controls” on page 6-13. Combo boxes A combo box component is a control that combines an edit box with a list much like that of a list box. Users can either type text in the edit box or select an item from the list. • When users enter data into the combo box, either by typing text or selecting an item from the list, the value of the Text property changes. • By default, the drop-down list will display eight items.
Your application determines the meaning of a grayed check box. Radio buttons Radio buttons present a set of mutually exclusive choices. You can use the radio button component to place individual buttons, or use the radio group component to set a rectangular region with a Caption property, and list your radio-button items using the Items property. See “Grouping components” on page 2-28 for more information. • Use the Caption property to set a value for the radio button. • When Checked is True, a black circle appears in the radio button, indicating that the option is selected.