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<!DOCTYPE concept
  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
<concept id="GUID-1BB546C1-2795-55D9-97B6-AC3F6AB79389" xml:lang="en"><title>Controls</title><prolog><metadata><keywords/></metadata></prolog><conbody>
<p>In the Symbian platform UI Control Framework, all UI elements (with a few
exceptions) are <keyword>controls</keyword>. A control is a rectangular area
of the screen that may respond to user input events. Buttons, menus, text
input boxes and application views displaying application-specific data are
all examples of controls. </p>
<p>All controls are implemented by deriving from the <codeph>CCoeControl</codeph> class.
Concrete implementations of controls are provided by a user interface library,
or by the application programmer. The control framework itself provides no
concrete controls. </p>
</conbody></concept>