The expressionfor the named property. Writeable only when canSetExpression for the named property is true. When you specify a value for this attribute, the string is evaluated.
• If the string contains a valid expression, expressionEnabled becomes true.
• If the string does not contain a valid expression, an error is generated, and expressionEnabled becomes
• If you set the attribute to the empty string, expressionEnabled becomes false, but no error is generated.
String; read/write if canSetExpression for the named property is true.