Sendkeys is not working for my .net application

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VBScript

I have the following code to install a windows desktop application.
the script is unable to click the 'Next' button on the installer wizard dialog.
In the following code sendkeys "{ENTER}" is used too press 'enter' key on the keyboard.
sendkeys "{ENTER}" is recognizing all the windows and dialogs expect my .net application


can someone help..vishnu

set oShell=CreateObject("Wscript.Shell")
oshell.Run"\\192.168.0.77\FTMBuild\Latest\FTMBuild\setup.exe"
wscript.sleep(10000)
oshell.AppActivate "Family Tree Maker 2012 -InstallAware Wizard"
oShell.sendkeys "{ENTER}"
wscript.sleep(20)
oshell.sendkeys "{ }"
wscript.sleep(20)
oShell.sendkeys "{ENTER}"
wscript.sleep(60)
oShell.sendkeys "{ENTER}"
wscript.sleep(20)
oShell.sendkeys "{ENTER}"
wscript.sleep(20)
oShell.sendkeys "{ENTER}"
wscript.sleep(20)
oShell.sendkeys "{ENTER}"
wscript.sleep(20)
oShell.sendkeys "{ENTER}