🚀 go-pugleaf

I have a running application that I would like to read or modify from 
another.  To start out with, I just wanted to make a simple test app. 
The first app is a simple vcl app with only an edit box on it, the other 
app would control the first, if it was running.

With the following I can get a handle that matches the edit box on the 
running executable:

   HANDLE SubForm = NULL;
   HANDLE EditBox = NULL;
   String TheClassName = ClassNameEditBox->Text;
   String TheWindowName = WindowNameEditBox->Text;
   SubForm = FindWindow(TheClassName.c_str(), TheWindowName.c_str());
   EditBox = GetWindow(SubForm, GW_CHILD); //the editbox is the only 
child on the test standalone app.


Now, when I try to set or get the text in the editbox, nothing happens. 
  How can I do that?

SetWindowText(EditBox,TestMessage->Text.c_str());  //TestMessage is a 
TEdit on my main form

I've also tried  SetDlgItemText(EditBox, i, TestMessage->Text.c_str()); 
looping thru i=0 to 100000.

I've also tried the corresponding Get...Text, with no luck.

Alas, a new frontier that ought to be so easy and basic.  What am I 
doing wrong?