Selenium modal xpath - html

Question

I need to select this input ...
(name="BtnNext" value="İLERİ" class="NavigationButtonNextLightBox ")
... with xpath after this modal popup. I cant use .FindByClass because there are same classes in the main page, but I need open which in (id="__LIGHTBOX__") modal;
<div style="overflow: visible; padding: 0px; width: auto; min-height: 143px; max-height: none; height: auto;" class="ui-dialog-content ui-widget-content" id="__LIGHTBOX__">
<div class="__BOX__">
<input name="BtnClose" class="BoxButtonClose" type="button">
<div>
<img src="/Content/themes/base/images/popup-bg-top.png">
</div>
<div class="popupCapsule clearFix">
<form action="/BillPayment/TransferInfo" method="post">
<div class="banner clearFix">
<h1 class="pageTitle">Fatura Ödeme</h1>
</div>
<div class="relatedPeopleContainer clearFix">
<div class="topDiv">
</div>
<div class="relatedPeople clearFix">
<table>
<tbody>
<tr>
<td class="t1">
<img src="Content/banks/bank205.png">
</td>
<td class="t2 SenderReceiverSubmit" rowspan="2" style="cursor: pointer;">
<div class="arrow">
</div>
</td>
<td class="t3">
<img src="Content/company/Turkcell.png">
</td>
</tr>
<tr>
<td class="t4">
<div class="info right">
<h2 class="NavigationButtonIndex" style="cursor: pointer;" title="Hesabınızı değiştirmek için tıklayınız.">HESABIM
<img src="/Content/themes/base/images/change-account.png" alt="" style="height: 20px; vertical-align: text-bottom;">
</h2>
<p class="first">
Beşyüzevler Şube
</p>
<p>
Cari Hesap
</p>
<p>
10136046-1
</p>
<p>
1.256,51 TL
</p>
</div>
</td>
<td class="t6">
<div class="info left">
<h2>TURKCELL
</h2>
<p class="first">
1774862559
</p>
<p>
5303003816
</p>
<p>
23,40 TL
</p>
</div>
</td>
</tr>
</tbody>
</table>
</div>
<div class="bottomDiv">
</div>
</div>
<div class="amountEntry clearFix">
<table class="moneyEditorTable ">
<tbody>
<tr>
<td>
<input class="integerinput " data-val="true" data-val-regex="The field Integer must match the regular expression '[0-9.,]{1,11}'." data-val-regex-pattern="[0-9.,]{1,11}" datavalrequired="" disabled="disabled" id="IntegerInput" name="Amount.Integer" onkeyup=";" value="23" type="text"></td>
<td class="spanTd">
<span class="currency ">,</span>
</td>
<td>
<input maxlength="2" class="decimalinput " data-val="true" data-val-range="The field Decimal must be between 0 and 99." data-val-range-max="99" data-val-range-min="0" datavalrequired="" disabled="disabled" id="DecimalInput" name="Amount.Decimal" onkeypress="return BOA.Web.Validation.NumericControl(event);" onkeyup=";BOA.Web.Validation.DecimalPoint(event, $(this));" onpaste="BOA.Web.Validation.NumericEditorPaste(event, $(this));" value="40" type="text"></td>
<td class="spanTd">
<span class="currency ">TL</span>
</td>
</tr>
</tbody>
</table>
<input id="Amount_FECCode" name="Amount.FECCode" value="TL" type="hidden">
<div class="Error clearFix">
<span class="field-validation-valid" data-valmsg-for="Amount" data-valmsg-replace="true"></span>
</div>
</div>
<table class="popupButtonArea">
<tbody>
<tr>
<td class="left">
<input name="BtnPrev" value="GERİ" class="NavigationButtonPrev " type="button">
</td>
<td class="right">
<input name="BtnNext" value="İLERİ" class="NavigationButtonNextLightBox " type="button">
<input name="FromStep" value="TransferInfo" type="hidden">
</td>
</tr>
</tbody>
</table>
<input name="__RequestVerificationToken" value="jzI4c0v-PPC60xzaY8B2FDiCLYmHwCCtQsYv7UbBIMgnBWFeEpJoLLMDgf4LGl24WxhfizGlsqEJdjhywzgNHT785XHRzmwcU2qDyaQfSh6SajD8WKCAEq2L8CejPMJ65QL45A2" type="hidden">
</form>
</div>
<div>
<img src="/Content/themes/base/images/popup-bg-sub.png">
</div>
</div>
</div>

Answer 1

You can try to find the element by the following xpath :
//div[contains(#id, 'LIGHTBOX')]//input[#name='BtnNext' and contains(#class, 'NavigationButtonNextLightBox')]
Above xpath attempt to find a <div> having id contains LIGHTBOX, then from within that <div> get <input> element having name attribute equals BtnNext and class attribute contains NavigationButtonNextLightBox

Answer 2

Not sure am i missing somehting here, but whats stopping you from selecting by name?
WebElement btnNext = driver().findElement(By.name("BtnNext"));