Word doesn' open on top of windows

Question

I am writing an app that opens a MS Word document by clicking on a file name (see an attached screenshot).
I use the commands:

aWordApplication.Visible = True
aWordApplication.Documents.Open(aFileName)
aWordApplication.Activate

Doing this, MS Word application runs (see the Word icon on the taskbar on the attached screenshot).

The problem is that I have to click the word icon to see the actual document.

I found there is a service called Microsoft Office Click-To-Run, I stopped it, try my app again, the Word start slower, then I found the Microsoft Office Click-To-Run running again.

Would you please help me to fix the problem, let a document opens on top of windows? Thanks.