[I haven't received it (yet?) but in the meantime you may want to look in Thomas Müller RxLib page or FraserSoft's RxLibrary Help. HTH
Note that the help files are in the old hlp file format. If you are on Windows 10 you will notice that this format is no longer supported. I remember that once I had found a trick how to activiate this nevertheless, but as usual I forgot it...
Now I tried to convert the hlp to chm which can be opened by the Lazarus chm viewer, lhelp:
- Downloaded the English RX help file from http://www.frasersoft.net/rxhelp/index.htm
- Used HelpDeco and HlpDecoGui to decompile the hlp file and extract html files and encorporated bmp images
- Used Microsoft Html Help Workshop to create the chm file from the project file created by the decompiler
Note that the decompilation process is not very precise and some features have been lost, e.g. the help contents displayed usually on the first page of the help vierwer.
Unfortunately the chm file is too large for an attachment here. Therefore, I added it to the rx repository on CCR - I hope AlexTp does not mind...
To find the help items for TRxDBLookupCombo type this word into the search filter of the help viewer.