GTKD - CSS class color "flash" delay

[TheDGuy via Digitalmars-d-learn]

On Saturday, 25 June 2016 at 15:26:00 UTC, TheDGuy wrote: }
> But i get the error:
> Error: none of the overloads of '__ctor' are callable using 
> argument types (bool delegate(void* userData), int, bool), 
> candidates are:

This is the correct error message:

Error: none of the overloads of '__ctor' are callable using 
argument types (bool delegate(Button currentButton), int, bool), 
candidates are: