Flex 2 Developer's Guide > Building User Interfaces for
Flex Applications > Using Flex Visual Components > Using the UIComponent class > Commonly used UIComponent properties

Commonly used UIComponent properties

The following table lists only the most commonly used properties of components that extend the UIComponent class:

Property	Type	Description
`doubleClickEnabled`	Boolean	Setting to `true` lets the component dispatch a `doubleClickEvent` when a user presses and releases the mouse button twice in rapid succession over the component.
`enabled`	Boolean	Setting to `true` lets the component accept keyboard focus and mouse input. The default value is `true`. If you set `enabled` to `false` for a container, Flex dims the color of the container and all of its children, and blocks user input to the container and to all its children.
`height`	Number	The height of the component, in pixels. In MXML tags, but not in ActionScript, you can set this property as a percentage of available space by specifying a value such as 70%; in ActionScript, you must use the `percentHeight` property. The property always returns a number of pixels. In ActionScript, you use the `perCent`
`id`	String	Specifies the component identifier. This value identifies the specific instance of the object and should not contain any white space or special characters. Each component in a Flex document must have a unique `id` value. For example, if you have two custom components, each component can include one, and only one Button control with the id "okButton".
`percentHeight`	Number	The height of the component as a percentage of its parent container, or for `<mx:Application>` tags, the full height of the browser. Returns `NaN` if a percent-based width has never been set or if a `width` property was set after the `percentWidth` was set.
`percentWidth`	Number	The width of the component as a percentage of its parent container, or for `<mx:Application>` tags, the full span of the browser. Returns `NaN` if a percent-based width has never been set or if a `width` property was set after the `percentWidth` was set.
`styleName`	String	Specifies the style class selector to apply to the component.
`toolTip`	String	Specifies the text string displayed when the mouse pointer hovers over that component.
`visible`	Boolean	Specifies whether the container is visible or invisible. The default value is `true`, which specifies that the container is visible.
`width`	Number	The width of the component, in pixels. In MXML tags, but not in ActionScript, you can set this property as a percentage of available space by specifying a value such as 70%; in ActionScript, you must use the `percentWidth` property. The property always returns a number of pixels.
`x`	Number	The component's `x` position within its parent container. Setting this property directly has an effect only if the parent container uses absolute positioning.
`y`	Number	The component's `y` position within its parent container. Setting this property directly has an effect only if the parent container uses absolute positioning.

Flex 2.01