'partial' keyword in C# is very good for project , what's the same thing in D?

[Gary Willoughby via Digitalmars-d]

On Monday, 10 November 2014 at 16:44:53 UTC, Andre wrote:
> Is there any possibility to access private members by using 
> Template Mixins?

Yes, like this:
https://github.com/nomad-software/tkd/blob/master/source/tkd/widget/common/value.d