I've implemented a hierarchical GridView with RadGridView in WPF and bound it MVVM style to an ObservableCollection of some custom object A which expose a child property which again is another ObservableCollection of some other type B.  It binds correctly and for the most part behaves correctly (virtualization doesn't work) but it is including a varying amount of blank vertical space between the top level rows which seems to correlate to some degree with the number of rows in the child GridView.

Seems like the GridView is just not able to correctly measure and size the vertical space necessary to accommodate the rows.

I've tried setting a fixed height on the container element which is a grid, setting the rowheight, the visiblerowheight, disable vertical scrolling - nothing seems to make a difference.

Desperate for a solution. Getting ready to throw in the towel and write my own regular ol' hierarchical data grid.

Any ideas?

Hello Jason,

Could you try setting RadGridView.GroupRenderMode property to Flat? GroupRenderMode Flat was introduced with Q2 2013 as a completely new logic for group rendering. The result was faster scrolling and very good performance, but it fixed a lot of other issues reproducible with the old Nested mode. This is way we recommend using the new rendering logic.


Regards,
Vera
Telerik