ryan_o

That works perfectly, thanks.

It does have both those things. I'll attach a sample project. It should compile and run, but when opening Frame.pas you will get an error that some properties don't exist and the frame will be converted to a form(it will gain a titlebar). FrameConversionSample.zip

So I have this class hierarchy: IBlah = interface procedure Foo; end; TBlahFrame = class(TFrame, IBlah) procedure Foo; virtual; abstract; end; TBlahFrameClass = class of TBlahFrame; and I'm using it like so // frame file TFrame1 = class(TBlahFrame) //... procedure Foo; override; end; // form procedure Inject(FrameClass: TBlahFrameClass); begin FSlot := FrameClass.Create(self); FSlot.Foo; end; And it works perfectly. But the problem is that whenever I close and reopen `TFrame1`'s file, it tries to convert it into being a form. The only way to change it back to being a frame is to switch the frame's superclass back to TFrame and reopen it again.