I am on 4.5.3 and this still occurs. All of the other filtering works great. However, the boolean filter seems to handle the initial mixed state fine. I click on it and it changes to a check and all of the true values are displayed. I click it again, the check goes away and all of the false values are displayed. Lastly, I click it again, to assume to go back to the mixed state but the graphic is a solid box (instead of the initial box with a dash in it) and just stays as the last set of results (the false records.) I know that it is showing just the false records based on the grids total records (because we have paging on as well.)
Here is the initial state when I come into the grid (everything shows):
Here is once I click on the filter the first time (to see just the true values):
Here is when I click it again (to see just the false values):
Lastly, clicking it again the box changes but the result set never changes:
Okay, digging in deeper I have narrowed it down to the Filter parameter. More specifically, the args passed in. We are using this event to catch and keep track of these filters so we can delete them all if necessary. While going through what happens on the even at each click of the filter (for this boolean) I believe you guys are passing the wrong value to the args.FilterValue.
So when I come to the page, the filter is in a mixed state (both true and false are valid) and when I click that filter checkbox here are the values that come in:
