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I have Delphi 11.2, Patch 1 running on Windows 11. This is my first post here so I hope someone can help. I want to create a new component that is a descendant of another component that is already installed. But I keep getting errors. As an example, here is what happens when I try to create a descendant of TButton... I did this: - Component | New Component - VCL for Delphi Win32 - select 'TButton' in list - Class Name = 'TMyButton' - Palette Page = 'Samples' - Unit Name = 'E:\MyButton.pas' - Selected 'Install to New Package' - Package Name = 'e:\MyOwnButton.dpk' - Click Finish. Got this error: --------------------------- Error --------------------------- Registration procedure, Mybutton.Register in package C:\Users\Public\Documents\Embarcadero\Studio\22.0\Bpl\MyOwnButton.bpl raised exception class EAccessViolation: Access violation at address 67127F63 in module 'rtl280.bpl'. Read of address 00000008. --------------------------- OK --------------------------- So, then I tried this: - Component | Install Packages - Add... - Browsed to select C:\Users\Public\Documents\Embarcadero\Studio\22.0\Bpl\MyOwnButton.bpl Got this error: --------------------------- MyOwnButton - Delphi 11 - MyButton [Built] --------------------------- Registration procedure, Mybutton.Register in package C:\Users\Public\Documents\Embarcadero\Studio\22.0\Bpl\MyOwnButton.bpl raised exception class EAccessViolation: Access violation at address 67127F63 in module 'rtl280.bpl'. Read of address 00000008. --------------------------- OK --------------------------- I am able to create TMyButton on Delphi 10.4 running on Windows 10 - so is there a bug in Delphi 11.2, am I doing something wrong or is there some other explanation?