Please see Demo https://dojo.telerik.com/UNOPUvaB/2

In first data row (Row 3) I create a range of numeric values from a , middle and maximum value.
Validation works perfectly, e.g. when manipulating the Middle value, I cannot go below minimum cell value and not above maximum cell value, until adjusted.

I want to accomplish the same with dates in second data row (Row 4 when I reference another "C4", it looks like validation works as expected, but the Date Picker is broken.