In a previous example, “Determining the number of lines in a TextArea control in Flex”, we saw how you could get the number of lines in an MX TextArea control by using the getTextField() method (in the mx_internal namespace) and the numLines property.

The following example shows how you can get the number of lines in a Spark RichEditableText control in Flex 4 by using the textContainerManager property (in the mx_internal namespace) and the numLines property.

Full code after the jump.

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