How to validate multiple controls using a single Validator?

Question

I am trying to do an HourValidator because Flex doesn't have
this, so i am extending from the Validator class. I read in the
Creating and extending Flex components document the
following:
"A validator can validate more than one field at a time. For
example, you could create a custom
validator called NameValidator to validate three input
controls that represent a person’s first,
middle, and last names.
To create a validator that examines multiple fields, you can
either define properties on the
validator that let you specify the multiple input fields, as
does the Flex DateValidator class
class, or you can require that the single item passed to the
validator includes all of the fields to
be validated."
So according to the document i need to define properties so i
defined 4 properties:
startHourSource: the input control containing the starting
hour
startHourProperty: the control's property (in this case the
text property)
endHourSource: the input control containing the end hour
endHourProperty: the control's property (in this case the
text property)
The thing is that when i call the doValidation of the
superclass (to validate the required property) it does return a
validation error but it doesn't mark the input control with the red
frame that indicates there's a validation error. I assume that is
because the
source and
property properties of the validator are null but that's ok
because i am not using them, instead i am using the 4 properites
mentioned above.
So what do i need to do or override so the red frame appears
in the input controls??

Answer 1

Yeah i already know that, but when you use the doValidation
method, which does the requiredField validation, by default marks
the input control with the red frame, so that's why i am trying to
do, doing it so it will do it by default.
For example, try this:
<mx:TextInput id="test"/>
<mx:Validator id="validateTest" source="{test}"
property="text" required="true" requiredFieldError="The field is
empty"/>
If you do
validateTest.validate( ) and the textinput is empty, it will
mark it with the red frame by default, that's the kind of behave i
want for my HourValidator, but if it is not possible then the
solution you suggested would be the only one to do this.