Thank you for getting back to us! This is the Border named GridViewHeaderCell_Selected, which appears when you click on the sorting icon. You may change this through predefining the template of GridViewHeaderCell in Metro Theme and add a corresponding Margin.
Regarding your second question: RadTreeListView directly inherits RadGridView. From the UX point of view RadTreeListView have 2 separate templates for its own template and for TreeListViewRow.
The rest parts are directly used from RadGridView. In Metro theme the Foreground is different in these components and this is by design. Instead of keeping separate styles you may modify the default Metro theme and its styles to achieve the desired look and feel.
In our online documentation we have an article which demonstrates how this can be achieved.
the Telerik team
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