Selecting item in QML TreeView does not change isSelected of item

[ocgltd]

I have created a simple TreeView in QML, with several levels of nesting. I have also created an "itemDelegate" and a "rowDelegate"; both of which switch background color between red/black bound to their respective isSelected.

When I click on an item the ROW color changes, but the item does not. I confirmed the itemFlag for each item includes ItemsIsSelectable and ItemIsEnabled (default).

My itemDelegate contains:

Rectangle {
                   color: styleData.isSelected ? "red" : "black"

I added a selection to the treeview:

ItemSelectionModel {
          id: treeViewSelectionModel
          objectName: "treeViewSelectionModel"
          model: treemodel
          onCurrentChanged:{console.log("Selection - current changed from ",previous, " to ", current)}
      }

Which correctly prints out the new/previous selection. So it appears the item is being selected, but not changing color (the isSelected never changes for the item). Can someone explain why?

[ocgltd]

Problem is inconsistency in how QML names its methods. Some are "isSelected" (eg ROW), or "isExpanded" (ITEM), but item uses "selected" instead of "isSelected"