Using Style="color:#778CA2" on ProperyColumn also changes the style of its header

[thieng101]

Hello, I followed the instructions on the demo website to change the color of the text in a PropertyColumn. It is supposed to have the column change while its header remains unchanged, but it actually changes both the header and column (as shown in the picture).

This is my code:
<PropertyColumn Property="c => c.id" Style="color: #af5f00 ;" Align="Align.Start" Title="Order ID"/>

Please help. I'd very appreciate.