Background color for TreeView

[GrahamLa]

Hi
I want to set a background colour for my tree view but cannot find a way.
Say I have the following

Rectangle {
    width: 800
    height: 800
    anchors.fill: parent

    TreeView {
        id: view
        model: theModel
}

What do I need to set a background color?
Setting a color on the parent does not work and I cannot see how to use TreeViewStyle to do this.

Can anyone please help?