PropertyGridCommonDictionary

I am just now updating to your latest version.

I read that PropertyGridCommonDictionary no longer exists.  And that there is now AssetResourceKey

How do I change  the following brush keys: 

<SolidColorBrush x:Key="{x:Static themes:PropertyGridCommonDictionary.ForegroundDisabledBrushKey}" Color="Black" />

<SolidColorBrush x:Key="{x:Static themes:PropertyGridCommonDictionary.CategoryHeaderForegroundBrushKey}" Color="Black" />

Thanks,

Mary