Autohotkey to resize window with child windows

Question

I use FrontPage 2003 for linking html files, through the command 'Insert' > Hyperlink.

And the window opens as follows:

I made a script with Autohotkey to resize the window, so I see more of the files in the 'current folder' (I think the class is SysTreeView32), but it doesn't apply to the child windows (I guess it is called mdichild), it shows as follows:

What I need is to make the script resizes the window and all the child windows.

The current scrip is:

#NoEnv

ResizeWin(Width = 0,Height = 0)
{
  WinGetPos,X,Y,W,H,A
  If %Width% = 0
    Width := W

  If %Height% = 0
    Height := H

  WinMove,A,,%X%,%Y%,%Width%,%Height%
}

#!u::ResizeWin(800,800)

Answer 1

From the screenshot, it looks like the resize is working.

Unfortunately, there are some windows that just don't resize properly. I assume that if you use your mouse, you can't resize it manually either. This is especially prevalent for older programs.