Creating a Dialogbox to key in an amount

Hello all,

Im having difficulties to create a dialogbox to pop out and ask for an amount for user to key in

anyone can provide me a sample code for it ? 

this is how im doing it currently :-

static void RolloverDividen(Args _args)

{

    DialogButton        diagBut;

    DialogField         dialogField;

    FixDeposit      tblFixDeposit;

    str                 strMsg = "Rollover Fixed Deposit with Dividen ?";

    str                 strTitle = "Fixed Deposit Rollover";

    str                 strMsg2 = "Enter Your Actual Dividen Amount";

    str                 strTitle2 = "Fixed Deposit Rollover 2";

    ;

    diagBut = Box::yesNoCancel(strMsg,DialogButton::Yes,strTitle);

    if (diagBut == DialogButton::Yes)

    {

        diagBut = Box::okCancel(strMsg2,DialogButton::Ok,strTitle2);

How do i insert the amount ? 

Anyone can help ?