We've fixed the problem with selecting disabled items and the fix will be part of our next update Monday. It's not possible to check internally AllowSelectAll in case DropDownDataGrid since this functionality is not built-in however we've updated our demo.
Thanks echecv u too fast
So we cant have the same style as dropdown when a row is disabled? Cause checkboxes is created in the Template (by user not built in feature in radzen cmp) and so we cant access the DisabledProperty?
Like this: