How to change the component class?

Question

Delphi

The program written in Delphi 7 has a panel component. TPanel class. There are many other objects on the panel.
I want to replace this panel with another one, sPanel (Alpha Controls).
Of course, in the program code I refer to only one property - visible. It is on both panels.
Which program modules need to be changed?
I changed in Unit1.pas - type TPanel to sPanel and in Unit1.dfm TPanel to sPanel.
But when opened, it says that the sPanel class was not found, although sPanel is written in uses.
Or is such a replacement impossible and you have to create a new panel yourself, drag all objects and delete the old one?

Answer 1

The easiest way. Open DFM (RMB on the form, View as Text) and run Search-Replace.
After that, we make any changes to the module (yes, at least add a space and delete it), and save it. Automation will ask: replace? - we agree.

I changed in Unit1.pas - type TPanel to sPanel and in Unit1.dfm TPanel to sPanel.
But when opened, it says that the sPanel class was not found, although sPanel is written in uses.

If the module is called sPanel, then the component itself should be a little different. TsPanel?
UPD. Yes, TsPanel, if that's it.