How do I replace a component type that is on my form from TVirtualStringTree to TMyVirtualStringTree without damaging anything?

I have about 4 VirtualStringTrees that are of class TVirtualStringTree
and now I have a new component MyVirtualStringTree of type TMyVirtualStringTree which is inherited and slightly modified.

How can I change the components of all the existing ones from class TVirtualStringTree to take on the new class TMyVirtualStringTree without damaging the DFM file or destroying the app.

I use Delphi 2007 for win32

Ben
Alpha_AIAsked:
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diniludCommented:
Replace all "TVirtualStringTree" with "TMyVirtualStringTree" in both DFM and PAS file
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MerijnBSr. Software EngineerCommented:
make sure you close Delphi before doing this!
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