Wix Change Installation Path using UI Dialogs - wix

Question

I am creating an .msi for a console application using Wix 3.5. In that i am trying to give user an option to change the installation directory using UI dialogs. below is my code of Product.wxs :
<?xml version="1.0" encoding="UTF-8"?>
<Wix xmlns="http://schemas.microsoft.com/wix/2006/wi" xmlns:netfx="http://schemas.microsoft.com/wix/NetFxExtension">
<Product Id="{5E4364D8-DEBA-4615-990C-1C886E569F33}" Name="MeridianAutomationSetUp" Language="1033" Version="1.2.0.0"
Manufacturer="Meridian Automation" UpgradeCode="d479e1dc-eeff-4c66-a977-04f67f5348ae">
<Package InstallerVersion="200" Compressed="yes" InstallScope="perMachine" Platform="x86"
Description="Meridian" Comments="Meridian" InstallPrivileges="elevated"/>
<MajorUpgrade DowngradeErrorMessage="A newer version of Meridian Automation SetUp is already installed." Schedule="afterInstallInitialize" />
<MediaTemplate EmbedCab="yes"/>
<Feature Id="ProductFeature" Title="Meridian Automation Setup" Level="1">
<ComponentGroupRef Id="MeridianAutomationSetUp" />
</Feature>
<!--<Property Id="TARGETDIR" Value="C:"/>-->
<PropertyRef Id="NETFRAMEWORK45"/>
<Condition Message="This application requires .NET Framework 4.5. Please install the .NET Framework 4.5 then run this installer again.">
<![CDATA[Installed OR NETFRAMEWORK45]]>
</Condition>
<UIRef Id="MyUi"/>
<Property Id="WIXUI_INSTALLDIR" Value="INSTALLDIR"/>
<Property Id="WixShellExecTarget" Value="[#MeridianAutomation.exe]" />
<CustomAction Id="LaunchApplication" BinaryKey="WixCA" DllEntry="WixShellExec" Impersonate="yes" />
</Product>
<Fragment>
<Directory Id="TARGETDIR" Name="SourceDir">
<Directory Id="INETPUB">
<Directory Id="INSTALLDIR" Name="MeridianAutomation1" />
</Directory>
</Directory>
</Fragment>
</Wix>
Below is my UI Code :
<?xml version="1.0" encoding="UTF-8"?>
<!--
<copyright file="WixUI_InstallDir.wxs" company="Outercurve Foundation">
Copyright (c) 2004, Outercurve Foundation.
This software is released under Microsoft Reciprocal License (MS-RL).
The license and further copyright text can be found in the file
LICENSE.TXT at the root directory of the distribution.
</copyright>
-->
<!--
First-time install dialog sequence:
- WixUI_WelcomeDlg
- WixUI_LicenseAgreementDlg
- WixUI_InstallDirDlg
- WixUI_VerifyReadyDlg
- WixUI_DiskCostDlg
Maintenance dialog sequence:
- WixUI_MaintenanceWelcomeDlg
- WixUI_MaintenanceTypeDlg
- WixUI_InstallDirDlg
- WixUI_VerifyReadyDlg
Patch dialog sequence:
- WixUI_WelcomeDlg
- WixUI_VerifyReadyDlg
-->
<Wix xmlns="http://schemas.microsoft.com/wix/2006/wi">
<Fragment>
<UI Id="MyUi">
<TextStyle Id="WixUI_Font_Normal" FaceName="Tahoma" Size="8" />
<TextStyle Id="WixUI_Font_Bigger" FaceName="Tahoma" Size="12" />
<TextStyle Id="WixUI_Font_Title" FaceName="Tahoma" Size="9" Bold="yes" />
<Property Id="DefaultUIFont" Value="WixUI_Font_Normal" />
<Property Id="WixUI_Mode" Value="InstallDir" />
<DialogRef Id="BrowseDlg" />
<DialogRef Id="DiskCostDlg" />
<DialogRef Id="ErrorDlg" />
<DialogRef Id="FatalError" />
<DialogRef Id="FilesInUse" />
<DialogRef Id="MsiRMFilesInUse" />
<DialogRef Id="PrepareDlg" />
<DialogRef Id="ProgressDlg" />
<DialogRef Id="ResumeDlg" />
<DialogRef Id="UserExit" />
<Publish Dialog="BrowseDlg" Control="OK" Event="DoAction" Value="WixUIValidatePath" Order="3">1</Publish>
<Publish Dialog="BrowseDlg" Control="OK" Event="SpawnDialog" Value="InvalidDirDlg" Order="4"><![CDATA[WIXUI_INSTALLDIR_VALID<>"1"]]></Publish>
<Publish Dialog="ExitDialog" Control="Finish" Event="DoAction" Value="LaunchApplication" Order="999">WIXUI_EXITDIALOGOPTIONALCHECKBOX = 1 and NOT Installed</Publish>
<Publish Dialog="WelcomeDlg" Control="Next" Event="NewDialog" Value="InstallDirDlg">NOT Installed</Publish>
<Publish Dialog="WelcomeDlg" Control="Next" Event="NewDialog" Value="VerifyReadyDlg">Installed AND PATCH</Publish>
<!--<Publish Dialog="LicenseAgreementDlg" Control="Back" Event="NewDialog" Value="WelcomeDlg">1</Publish>
<Publish Dialog="LicenseAgreementDlg" Control="Next" Event="NewDialog" Value="InstallDirDlg">LicenseAccepted = "1"</Publish>-->
<Publish Dialog="InstallDirDlg" Control="Back" Event="NewDialog" Value="WelcomeDlg">1</Publish>
<Publish Dialog="InstallDirDlg" Control="Next" Event="SetTargetPath" Value="[WIXUI_INSTALLDIR]" Order="1">1</Publish>
<Publish Dialog="InstallDirDlg" Control="Next" Event="DoAction" Value="WixUIValidatePath" Order="2">NOT WIXUI_DONTVALIDATEPATH</Publish>
<Publish Dialog="InstallDirDlg" Control="Next" Event="SpawnDialog" Value="InvalidDirDlg" Order="3"><![CDATA[NOT WIXUI_DONTVALIDATEPATH AND WIXUI_INSTALLDIR_VALID<>"1"]]></Publish>
<Publish Dialog="InstallDirDlg" Control="Next" Event="NewDialog" Value="VerifyReadyDlg" Order="4">WIXUI_DONTVALIDATEPATH OR WIXUI_INSTALLDIR_VALID="1"</Publish>
<Publish Dialog="InstallDirDlg" Control="ChangeFolder" Property="_BrowseProperty" Value="[WIXUI_INSTALLDIR]" Order="1">1</Publish>
<Publish Dialog="InstallDirDlg" Control="ChangeFolder" Event="SpawnDialog" Value="BrowseDlg" Order="2">1</Publish>
<Publish Dialog="VerifyReadyDlg" Control="Back" Event="NewDialog" Value="InstallDirDlg" Order="1">NOT Installed</Publish>
<Publish Dialog="VerifyReadyDlg" Control="Back" Event="NewDialog" Value="MaintenanceTypeDlg" Order="2">Installed AND NOT PATCH</Publish>
<Publish Dialog="VerifyReadyDlg" Control="Back" Event="NewDialog" Value="WelcomeDlg" Order="2">Installed AND PATCH</Publish>
<Publish Dialog="MaintenanceWelcomeDlg" Control="Next" Event="NewDialog" Value="MaintenanceTypeDlg">1</Publish>
<Publish Dialog="MaintenanceTypeDlg" Control="RepairButton" Event="NewDialog" Value="VerifyReadyDlg">1</Publish>
<Publish Dialog="MaintenanceTypeDlg" Control="RemoveButton" Event="NewDialog" Value="VerifyReadyDlg">1</Publish>
<Publish Dialog="MaintenanceTypeDlg" Control="Back" Event="NewDialog" Value="MaintenanceWelcomeDlg">1</Publish>
<Property Id="ARPNOMODIFY" Value="1" />
<Property Id="WIXUI_EXITDIALOGOPTIONALCHECKBOXTEXT" Value="Launch Meridian Automation" />
</UI>
<UIRef Id="WixUI_Common" />
</Fragment>
</Wix>
However when i change the path , it still installs the application in default installation drive i.e C drive. I am searching this in net throughout but still facing the same issue.