We have a RadGridView that has 150,000 rows (and so is using the default UI virtualization) as well as default column filters available on each column. When we check one of the "distinct values" checkboxes on the Name column, the resulting grid displays only entries for the selected name as expected -- however, it doesn't display all the results that were in the 150,000 rows. It's hard to tell how it is deciding where to cut off the results, but since each row has a time stamp we can see that it takes the top rows up until a certain point and then stops. So for one case, 69 rows were displayed when there were 624 rows in total for that selected name.
I've searched around quite a bit but couldn't find this exact scenario addressed -- do you have ideas/suggestions for this problem?