Yes it is possible.
The link you posted is not the latest version of Dock Panel Suite.
Here is the the latest code on GitHub.
https://github.com/dockpanelsuite
I downloaded this version and tested there demo, it has quite a few bugs that you would first need to fix.
You would need to be familiar with C#.
Next you would need to build it as a C# dll.
Then convert it to a C++ dll for use with DBPro.
Luckily there is a converter.
http://www.virtualdarkarts.com/netdll.html
In order to use this you would need to know how to make a dll in C++ for DBPro. Which can be found on these forums.
We have done this except we used our own dock window code in C#.
Getting it to play nice with DBPro can be tricky.
If you are looking to do this for an in game menu, then this would not be the best solution.
If you are making some sort of game engine editor then this could be your solution.
The bottom line is that you can make C# dlls to work with DBPro.
We first developed our C# dock window code for our own "IDE" text editor for DBPro.
If you click on the banner you can download our "IDE" and see the dock windows in action.
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WindowsXP SP3,Vista,Windows 7 SP1, DBpro v7.7RC7
Stab In The Dark Editor
The coffee is lovely dark and deep,and I have code to write before I sleep.