Relax Breath of Solution.

The Flex 4 (codename: Gumbo) beta release is a major change from Flex 3. The Flex 4 beta introduces a new component and skinning architecture. As a Flex 3 developer, however, you will likely not encounter too many challenges when compiling Flex 3 applications with the Flex 4 beta, since a goal of the new release is to maintain backwards compatibility with Flex 3.

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Structure

Steps to reproduce:
1. Get the mx:Text compont
2. Fill with some text.
3. Run the project
4. Click and all select the text in the component,
5. Drag mouse in side the component to bottom words.
6. you may see, top line of the text invisible, it goes top and masked in component.

The following example shows how you can customize a Flex TextInput control’s error color and error string using the errorColor style and errorString property.

The following example shows how you can change the background color of a Flex error tip by setting the borderColor style on the .errorTip CSS selector.