Hi Sternas,
Sorry for the scarce information, I believed it was something wrong from my part. Here is it in detail:
Typhon64 v6.3 on windows 10 x64, last update.
1. I opened the sample project fpsgrid (from pl_FPSpreadsheet) and saved it to a new directory ct-test2. Renamed Form1 to Main Form. Saved and exit.
2. From the sample proyect tools in lz_taChart copied toolsdemomw.pas and toolsdemomw.frm to ct-test2.
3. Restarted typhon, opened the project, and in the project inspector added toolsdemomw.pas. Double clicking on it opens the source file in the editor, but not the form in designer (please see screencapture in the attached .zip).
4. Adding in MainForm a button ("ShowPlot") with statements to create and show Form1 (in toolsdemomw unit) works properly: running the project it opens the toos demo form.
I am attaching a .zip file containing the project files along with the screen capture. Note that the IDE is in Spanish, hope it is not a problem for you. Please let me know if I you need some additional info.
Additionally, in the course of doing the above, I noticed some oddities which seem IDE bugs:
A. When doing "Save project As ..." the units are not automatically saved, one has to save the save the unit(s) manually; in doing that, one is asked about forgetting the original directory and deleting the original file (this looks as dangerous).
B. Attempting to rename the form in fpsgridmw results in an "error file not found *.ctrs", pointing to an initialization section containing the {$I *.ctrs} directive. However, if one compiles the sample as is no error results, and there is no *.ctrs file. Removing that section cured the problem and apparently did not have another effect.
C. After moving the project, the project inspector seemed to remember the old placement of the unit files, and I had to do a move. Perhaps that should have been done in A, but it is not clear for me.
D. When a project is closed, the Project assistant pops up. One of the options is View example projects, however if one clicks it, albeit another windows pops up, eventually showing the list, the assistant window remains on top, precluding any operation on the other window. Closing the assistant closes the IDE, so that option is not working.
Thank you for your attention