[Lazarus] Writing a custom lazarus dropdown control

[Erwin van den Bosch]

Hello group,

I'm trying to convert some Delphi component to Lazarus. But without much 
success.
It's an Edit control with buttons in it and a dropdown panel. Just like 
a combobox. I use this component for creating date selection controls 
and custom lookup comboboxes.

It uses some windows specific calls. I need some help to convert/rewrite 
it under Lazarus. I would be very happy if I can get it to work under 
Windows and Linux but for now Windows only is good enough. I'm porting a 
one million lines project from Delphi to Lazarus and these custom 
components are very important for that project.

I have written a small Delphi app/unit with the main functionality. 
(Delphi 2007)

http://download.fpc-lazarus.nl/DropdownCtrl.rar

There is a compiled exe included. Please take a look at the code. Can it 
be done with Lazarus?

Thanks!

Regards,
Erwin van den Bosch

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