I think that is not the problem because when i remove the .browser file from APP_Browser it shows the menu with the same sitemap.
Now i have set the show starting node = false in the sitemapdatasource and still the same thing i am able to see the Menu if App_browser is not available but if APP_Browser available than there is no menu display and html generated given below:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head><title>
Untitled Page
</title><style type="text/css">
.Menu1_0 { background-color:white;visibility:hidden;display:none;position:absolute;left:0px;top:0px; }
.Menu1_1 { text-decoration:none; }
.Menu1_2 { }
</style></head>
<body>
<form name="form1" method="post" action="WebForm4.aspx" id="form1">
<div>
<input type="hidden" name="__VIEWSTATE" id="__VIEWSTATE" value="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" />
</div>
<script src="/WebResource.axd?d=y8-iM2eUMVyTHGt70nwn3kRKG3waJSxIyuFUetwNYCZX_aPbnGmPdkAOTHawR87zvRsCGTsMfAq4vbXYvH771Q2&t=633613184498673342" type="text/javascript"></script>
<script src="/WebResource.axd?d=y8-iM2eUMVyTHGt70nwn3kRKG3waJSxIyuFUetwNYCZ3xn8sFpSgVCipJHV1uhF06xzsWOLxH_mvWMjiYtQ3Kw2&t=633613184498673342" type="text/javascript"></script><link href="/WebResource.axd?d=y8-iM2eUMVyTHGt70nwn3ndmMrO7_yrew4KeuUpNlFR6EP86q3TI3iQDDZdhuZsB0&t=633613184498673342" type="text/css" rel="stylesheet"></link><link href="/WebResource.axd?d=y8-iM2eUMVyTHGt70nwn3md7bBltIkvwVYCn9AAMwfeVNQnGSf4FATsNrGirqDnW6D2Z81CKK0zcF7Y6aGlsWQ2&t=633613184498673342" type="text/css" rel="stylesheet"></link>
<div>
<div class="AspNet-Menu-Vertical" id="Menu1">
<ul class="AspNet-Menu">
<li class="AspNet-Menu-WithChildren">
<a href="/rc_welcome.aspx" class="AspNet-Menu-Link" title="Risk Control Welcome Page">
Risk Control</a>
<ul>
<li class="AspNet-Menu-Leaf">
<a href="/FundRiskControls/rc_add.aspx" class="AspNet-Menu-Link">
Add plan forecasts</a>
</li>
<li class="AspNet-Menu-Leaf">
<a href="/FundRiskControls/rc_add_plan_date.aspx" class="AspNet-Menu-Link">
Add plan forecasts</a>
</li>
<li class="AspNet-Menu-Leaf">
<a href="/FundRiskControls/rc_appr.aspx" class="AspNet-Menu-Link">
Approval forecasts</a>
</li>
<li class="AspNet-Menu-Leaf">
<a href="/FundRiskControls/rc_chng.aspx" class="AspNet-Menu-Link">
Edit plan forecasts</a>
</li>
<li class="AspNet-Menu-Leaf">
<a href="/FundRiskControls/rc_custom.aspx" class="AspNet-Menu-Link">
Custom View</a>
</li>
<li class="AspNet-Menu-Leaf">
<a href="/FundRiskControls/rc_view.aspx" class="AspNet-Menu-Link">
View Warningd</a>
</li>
</ul>
</li>
<li class="AspNet-Menu-WithChildren">
<a href="/ft_welcome.aspx" class="AspNet-Menu-Link" title="Fund Thredhold Welcome Page">
Fund Threshold</a>
<ul>
<li class="AspNet-Menu-Leaf">
<a href="/FundThredhold/ft_view.aspx" class="AspNet-Menu-Link">
View/Update Fund Type</a>
</li>
<li class="AspNet-Menu-Leaf">
<a href="/FundThredhold/ftt_view.aspx" class="AspNet-Menu-Link">
View/Update Fund Type Thredhold</a>
</li>
</ul>
</li>
<li class="AspNet-Menu-WithChildren">
<a href="/fw_welcome.aspx" class="AspNet-Menu-Link" title="Fund Warning Welcome Page">
Fund Warning</a>
<ul>
<li class="AspNet-Menu-Leaf">
<a href="/FundWarning/fw_view_fund.aspx" class="AspNet-Menu-Link">
View Warnings</a>
</li>
<li class="AspNet-Menu-Leaf">
<a href="/FundWarning/fw_warn_hist.aspx" class="AspNet-Menu-Link">
View All Movement</a>
</li>
<li class="AspNet-Menu-Leaf">
<a href="/FundWarning/fw_dead_fund_view.aspx" class="AspNet-Menu-Link">
Dead Funds</a>
</li>
</ul>
</li>
<li class="AspNet-Menu-WithChildren">
<a href="/cfg_welcome.aspx" class="AspNet-Menu-Link" title="Configuration Welcome Page">
Configuration</a>
<ul>
<li class="AspNet-Menu-Leaf">
<a href="/FundConfiguration/cfg_fm_view.aspx" class="AspNet-Menu-Link">
View Fund Mapping</a>
</li>
<li class="AspNet-Menu-Leaf">
<a href="/FundConfiguration/cfg_fm_add.aspx" class="AspNet-Menu-Link">
Add Fund Mapping</a>
</li>
<li class="AspNet-Menu-Leaf">
<a href="/FundConfiguration/cfg_ft_view.aspx" class="AspNet-Menu-Link">
View Fund Type</a>
</li>
<li class="AspNet-Menu-Leaf">
<a href="/FundConfiguration/cfg_ft_add.aspx" class="AspNet-Menu-Link">
Update Fund Type</a>
</li>
<li class="AspNet-Menu-Leaf">
<a href="/FundConfiguration/cfg_email_view.aspx" class="AspNet-Menu-Link">
View Email Setup</a>
</li>
<li class="AspNet-Menu-Leaf">
<a href="/FundConfiguration/cfg_email_upd.aspx" class="AspNet-Menu-Link">
Update Email Setup</a>
</li>
<li class="AspNet-Menu-Leaf">
<a href="/FundConfiguration/cfg_fund_type_email_setup.aspx" class="AspNet-Menu-Link">
Fund Type Level Email Setup</a>
</li>
<li class="AspNet-Menu-Leaf">
<a href="/FundConfiguration/cfg_edit_usr_find.aspx" class="AspNet-Menu-Link">
Edit User</a>
</li>
<li class="AspNet-Menu-Leaf">
<a href="/FundConfiguration/cfg_add_usr.aspx" class="AspNet-Menu-Link">
Add New User</a>
</li>
<li class="AspNet-Menu-Leaf">
<a href="/FundConfiguration/cfg_custom_profile_find.aspx" class="AspNet-Menu-Link">
Edit Profile</a>
</li>
<li class="AspNet-Menu-Leaf">
<a href="/FundConfiguration/cfg_add_custom_profile.aspx" class="AspNet-Menu-Link">
Add New Profile</a>
</li>
</ul>
</li>
</ul>
</div>
</div>
</form>
</body>
</html>