TextInput is already available for Flex Mobile.

Not sure if that is what you wanted to ask?

Are you talking about validators?

eg: Phone Number validator.

Also, you can combine Formatter with Validator to get exact format in your textinput.

I created a sample application.Check if this can help you.

<?xml version="1.0" encoding="utf-8"?>

<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"

                                 xmlns:s="library://ns.adobe.com/flex/spark"

                                 xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600">

          <s:layout>

                    <s:VerticalLayout/>

          </s:layout>

          <fx:Script>

                    <![CDATA[

                              import mx.events.ValidationResultEvent;

                              private var validResult:ValidationResultEvent;

                              protected function button1_clickHandler(event:MouseEvent):void

                              {

                                        validResult= phValidator.validate();

                                        if (validResult.type == ValidationResultEvent.VALID)

                                        {

                                                  readyNum.text=phFormatter.format(phNum.text) ;

                                        }

                                        else

                                                  readyNum.text="";

                              }

                    ]]>

          </fx:Script>

          <fx:Declarations>

                    <mx:PhoneFormatter id="phFormatter" formatString="(###) ###-####" validPatternChars="#-() "/>

                    <mx:PhoneNumberValidator id="phValidator" property="text" source="{phNum}"  allowedFormatChars=""/>

          </fx:Declarations>

          <mx:Form>

                    <mx:FormItem label="Enter 10-digit Phone Number:">

                              <s:TextInput id="phNum" text="" width="100%"/>

                    </mx:FormItem>

                    <mx:FormItem label="Your Formatted Phone Number: ">

                              <s:TextInput id="readyNum" text="" width="100%" editable="false"/>

                    </mx:FormItem>

                    <mx:FormItem>

                              <s:Button label="Validate and Format" click="button1_clickHandler(event)"/>

                    </mx:FormItem>

          </mx:Form>

</s:Application>

you can apply the following handler on Change event of textinput phNum :

protected function phNum_changeHandler(event:TextOperationEvent):void

                              {

                                        if(phNum.text.length >=10)

                                        {

                                                  validResult= phValidator.validate();

                                                  if (validResult.type == ValidationResultEvent.VALID)

                                                  {

                                                            phNum.text=phFormatter.format(phNum.text);

                                                  }

                                                  else

                                                            readyNum.text="";

                                        }

                                        else

                                                  readyNum.text= "";

                              }

But then,after runtime format on the same textinput, it would be giving error message saying 'invalid characters in textinput' because of the round brackets.

So, you can apply the formatting on another textinput i.e readyNum  on change event of the previous textinput.

Might help you.

Replace

<mx:PhoneFormatter id="phFormatter" formatString="####-####" validPatternChars="#-() "/>

with

<mx:PhoneFormatter id="phFormatter" formatString="#####-#####" validPatternChars="#"/>

Post your error please.

add the following property to PhoneNumberValidator

allowedFormatChars="-"

Can you post your code over here so that I can just check it?