skopiowac plik do katalogu
c:\WINDOWS\system32\ElcServerProj1.ocx

z wiersza polecen uruchomic:
c:\> regsvr32.exe ElcServerProj1.ocx

If the registration worked, then go to the front panel add a ".NET and Active X" ->  "ActiveX Container" control to your block diagram. 
then right-click on it and choose "Insert ActiveX control". A dialog box will appear and in the drop-down, 
hopefully your OCX control will be listed (with it's full name, not the filename).  
Sometimes it depends on which specific control it is (which you have not yet mentioned).	