Was this ever actually implemented?
I bought the 11.0/11.2 control a little over a year ago and quickly became frustrated with it. First of all, despite being advertised as .NET 2.0 compatible out of the box, you actually have to fix bits of the source code for it to even compile. But more importantly, designer support appears to be virtually non-existent (in .NET 4.0 as well as .NET 2.0). When you drag it onto a form, goes down where Visual Studio puts non-visual controls like timers. It completely skips the part where it's supposed to put lines like "MyForm.Controls.Add(MyGrid);" into the form's initialization. When you manually do that, it now shows, but there's virtually no design-time support beyond that.
You can select the control, sometimes (it seems to depend on unselecting the form, so if there are other controls present, it'll select them instead), but there's no indication that it's selected. You can't move it, except with the arrow keys. There's no resizing box so you can't resize it. In the property list, only the most basic types actually (sort of) work - strings, integers, enumerators, etc. More advanced stuff like columns, structures, or exposed controls is a toss up depending on what version of Visual Studio I used. Sometime I get the ellipsis to bring up an editor, sometimes I get the plus sign to expand a structure, usually I just get the class name. The handful of times I got an editor, the changes showed (somewhat) at design time but not run time.
Bizarrely, I downloaded an ancient 3.0 version (2012) and that has far better design-time support. But it's also got numerous bugs, like the scrollbar buttons not actually working, and I haven't put it through any serious use yet.
I bought this because I was getting too deep into the weeds trying to fix the stock DataGrid and DataGridView. For all of the great looking screenshots on the site, I'm pretty disappointed about how it "works" in practice.