Modify foreground color of Selected/Hovered row
This help article explains how to change the foreground color of the TreeListViewRow upon selecting it or hovering over it.
Creating a Style Targeting TreeListViewRow
In order to achieve this you can create a style targeting TreeListViewRow and add triggers that change its Foreground as demonstrated in Example 1.
Example 1 uses the WarehouseViewModel and its dependencies defined in the Getting Started article of the RadTreeListView.
Example 1: Custom style targeting TreeListViewRow
The demonstrated approach may not be relevant for all UI for WPF themes.