Delphi: How to get rid of "Ancestor of TMyForm not found error'?

Question

I have some forms inherited from a TMyForm (TMyForm is a 3rdparty component with source code form).

When I open in the IDE my forms inherited from TMyForm I have:

Error creating form: Ancestor for 'TMyForm ' not found.

The workaround is to open the TMyForm unit in the IDE and then try top open my inherited forms.

But how can I avoid that Delphi gives this error and is able to open my forms even if TMyForm is not opened in the IDE?

Answer 1

You need to have the parent form opened in the IDE or added to the project, there's no workaround, unfortunately. Over here: Register custom form so I can inherit from it from multiple projects, without copying the form to the Object Repository folder I attempted lots and lots of things, without success.

Answer 2

My Workaround. There are several ways:

• Add to project full path to all of the parent form. Uncomfortable, because of absolute path
• Add package with parent forms to the project list. In this case, no problems there. But every time it is necessary to open a components in the delphi environment.
• Use a temporary solution from embarcadero.

There is automatically opens all the child forms:

Ticket, was created about 10 years ago: http://qc.embarcadero.com/wc/qcmain.aspx?d=8376

Here you can download the version for Delphi XE2: https://bitbucket.org/hemn/autoopenunit

I recommend it!