By Using applcation.sendkeys("{Enter}"), I can simulate a key stroke to cheap macro. It works perfectly. Hooray.Here are two reference I have found on the web. It leads me to find the answer of my own problem.http://www.mrexcel.com/archive2/74400/86401.htmhttp://72.14.253.104/search?q=cache:QpVmtxMj-AgJ:answers.google.com/answers/threadview%3Fid%3D770960+how+to+manipulate+keystroke+buffer+for+VBA&hl=en&ct=clnk&cd=2&gl=au