Cisco Cisco Computer Telephony Integration Option 8.5 Developer's Guide

While most settings in CTI OS are downloaded from CTI OS server to the client, 
ActiveX controls additionally offer property pages. The activation of the property 
pages is container dependent (e.g. in Visual Basic, you can “right-click” on an 
ActiveX control and select Properties from the pop-up menu). In CTI OS the most 
common properties selectable via property pages are ButtonType (e.g., The 
Holdctl can be a hold or retrieve button), as well as fonts and colors.

Most of the CTI OS ActiveX controls are either Button Type Controls or Grid 
Type Control, with the following exceptions:

Statusbarcontrol

ChatCtl

Some of the Utility controls (CtiCommonDlgs, SubClassFormCtl).

As such they share common principles. 

Button Controls include the AgentStateCtl, AlternateCtl, AnswerCtl, BadLineCtl, 
ConferenceCtl, EmergencyAssistCtl, HoldCtl, MakeCallCtl, ReconnectCtl, 
SupervisorOnlyCtl, RecordCtl, and TransferCtl. They provide an UI to perform a 
certain CTI task (like logging in or answering a call). All of the Button Controls 
are based on the CTI OS ButtonCtl (see Utility controls) and share the same 
characteristics. All CTI OS buttons will enable and disable themselves 
automatically based on the current state of the system. For example, if an agent is 
not logged in, the only button available to click is the Login Button (see 
AgentStateCtl), or if a call has not been answered and is selected in the 
CallAppearanceCtl, the Answer Button will be enabled (see AnswerCtl and 
CallAppearanceCtl). All buttons can be configured via their property pages to 
show custom text captions, custom icons and custom tooltip captions.