TDataModule inheritance

When I'm trying to inherit TDataModule Delphi treat descendant class like a form giving them 开发者_高级运维properties like font and Client properties. ("property does not exists" exception on a run-time)

TixDataModule = class(TDataModule);

TDM = class(TixDataModule)
end;

What Can I do to make it work?

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Make sure that all the inherited components is marked with inherited rather than object in the in the dfm.

Toggle "dfm as text" and "dfm as visual" with Alt+F12.

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1. As TixDatamodule is just a synonym for TDatamodule, you can inherit directly from TDataModule
2. If you really want to inherit from TixDataModule, then put TixDataModule in a separate unit, with its own .dfm.