Clicking a button on a application is not working through VBscript

Hi I am trying to click the next button on an application using VB script but the next button dialog box is getting highlighted but it is not proceeding please see the code below and provide me some suggestion,
Dim objShell
Set objShell = WScript.CreateObject("WScript.Shell")
Wscript.Sleep 4000
objShell.SendKeys "%{N}"

Have you tried sending space after the button is highlighted?

If I am not mistaken the spacebar will press a button if it has focus.