We've run into an issue with the RadGridView column filters when switching to another application that we haven't been able to resolve (2016.1.112.45). The issue occurs under the following circumstances:
1. Click on the column filter button to open the column filter pop-up
2. Click on a combo-box within the column filter to display the combo-boxes drop down list
3. Hit Alt+Tab on the keyboard (or click another application from the Windows taskbar).
As far as I can tell no other special circumstances are required to recreate. As focus leaves the application the combo-box drop down list closes properly however the column filter stays open on top of the newly activated application. Any guidance would be greatly appreciated. Thanks,