All:
So far I like your toolkit, except when it comes to integrating it with other tool kits and it all has to do with the z-Index.
I first ran into the issue of the z-Index being locked to 9999 trying to use the menu, but since that widget was not really what I wanted out of your toolkit, I moved on to the grid.
I would enclose an image, which would be worth a thousand words, of the issue that I am having, where the filter popup shows behind the grid itself., but unfortunately you do not have a way to attach such image.
And before I write a thousand words: How do I control the z-Index of the widgets/popups/anything else included in the toolkit. By the way I am using 2.8.1 (commercial version) and if you want to see the image go here