The grid has grouping and hierarchy. When the grid is loaded initiially, all hierarchy rows are collapsed. When a grid group is collapsed and then expanded, all hierarchy rows get expanded. I don't see any configuration changes to stop it. Some of the related markup:
<
MasterTableView
HierarchyLoadMode
=
"Client"
HierarchyDefaultExpanded
=
"false"
GroupLoadMode
=
"Client"
>
ExpandCollapseColumn
Visible
=
"True"
>
</
ExpandCollapseColumn
>