a) In the
IDE, choose Component | Installed .NET Components.
In the dialog that appears, select the .NET
VCL
Components tab and click Add. Navigate to the Delphi 8
installation bin directory, select
Borland.Vcl.Design.Xml.dll, and click OK.
OR
b) Close the
IDE and use regedit to add a new string entry,
"$(
BDS)\Bin\Borland.Vcl.Design.Xml.dll" = "Borland
XML
Components" to registry key
HKEY_CURRENT_USER\Software\Borland\
BDS\2.0\Known
Assemblies and restart the
IDE. Please read the WARNING at
the end of this file before editing your system registry.