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Here's a bit of code that will probably help you on your way:

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HWND h, hmdi, hwndKazaa, hwndDLTraffic;

hwndKazaa = FindWindow( "Kazaa", NULL );
hmdi=FindWindowEx(hwndKazaa,NULL,"MDIClient",NULL);
h=FindWindowEx(hmdi,NULL,NULL,"Traffic");//traffic tab
h=FindWindowEx(h,NULL,NULL,NULL); // download part
h=FindWindowEx(h,NULL,NULL,NULL); //dialog
h=FindWindowEx(h,NULL,NULL,NULL); //static
hwndDLTraffic=FindWindowEx(h,NULL,"SysTreeView32",NULL); //download
systreeview32                    

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var
  h,hmdi,hwndKazaa,hwndDLTraffic: HWND;
begin
  hwndKazaa := FindWindow( 'Kazaa', 0 );
  hmdi := FindWindowEx(hwndKazaa,0,'MDIClient',0);
  h := FindWindowEx(hmdi,0,'','Traffic');
  h := FindWindowEx(h,0,'','');
  h := FindWindowEx(h,0,'','');
  h := FindWindowEx(h,0,'','');
  hwndDLTraffic := FindWindowEx(h,0,'SysTreeView32','');
end;