Teach Yourself Borland C++ in 14 Days - portal

VCL Components
You can set this property to false, but by the time the component is placed, it is already too
late and you will have to change the font manually to the font you want for the component.
The Tag Property
The Tag property is nothing more than a 4-byte variable set aside for your use. You can use
the Tag property to store any data that your component might need. The data stored might
be a pointer to another class, an index value, or any number of other possibilities. Using the
Tag property would probably be considered an advanced programming technique.
Other Common Properties
Table 8.1 lists other common properties that are frequently used. These properties don’t
require as much explanation, so I just listed them here for your reference. Not all components
have each of the properties listed.
Table 8.1. Additional component properties.
Property Description
BorderStyle Can be bsSingle or bsNone. Use bsNone when you want the component
to blend in with the background.
Caption Sets the component’s caption. Many components do not have
captions, so for those components the Caption property is not
exposed.
Ctl3D Indicates whether the control should be drawn with a 3D border. If
BorderStyle is set to bsNone, this property has no effect.
Height Sets the component’s height.
HelpContext The HelpContext property is used to associate an index number in a
help file with a particular component.
Left Sets the x coordinate of the component.
PopupMenu Specifies the pop-up menu that will be displayed when the user clicks
the secondary mouse button.
TabOrder For windowed components. Sets this component’s position in the tab
order.
TabStop For windowed components. Indicates that this component can be
tabbed into. Setting this property to false removes the component
from the tab order.
281
continues
8