Sizing and aligning context menus in grid view

[s710]

I have a SilicaGridView inside which I create GridItem instances as delegates. I have attached a context menu using the menu property, and while it seems to work, the menu seems to open to the top, instead to the bottom.
E.g. I can see the grid cell beneath the tapped cell moving down, making room for the context menu, but the menu will open upwards, overlapping with the cell which was tapped.

Looks like this:

How can I make the menu open towards the bottom?

This is the QML:

Page {
    SilicaGridView {
        id: grid
        header: PageHeader { title: qsTr("Title") }
        cellWidth: width / 2
        cellHeight: width / 2
        anchors.fill: parent
        model: MyModel { id: myModel }

        delegate: GridItem {
            id: item
            width: grid.cellWidth
            height: grid.cellHeight

            _backgroundColor: "gray"

            menu: ContextMenu {
                MenuItem {
                    text: qsTr("Rename ..." + model.name)
                }
                MenuItem {
                    text: qsTr("Delete")
                }
            }

            Image {
                anchors.top: parent.top
                anchors.horizontalCenter: parent.horizontalCenter

                width: grid.cellWidth - 30
                height: grid.cellWidth - 30
                asynchronous: true

                source:  "image://nemoThumbnail/" + model.previewPath
                sourceSize.width: grid.cellWidth
                sourceSize.height: grid.cellHeight
            }
            Text {
                anchors.bottom: parent.bottom
                anchors.left: parent.left
                anchors.right: parent.right

                height: 30
                text: model.name + " (" + model.count + ")"
                horizontalAlignment: Text.AlignHCenter
                verticalAlignment: Text.AlignVCenter
                font.pointSize: 16
                color: Theme.primaryColor
            }
        }
        ScrollDecorator {}
    }
}

[rgrnetalk]

If you remove the GridItem dimensions (width: grid.cellWidth and height: grid.cellHeight), it works as expected

(From the documentation of ContextMenu: Warning: The ContextMenu internally adjusts its height whenever it is opened or closed. Therefore, the height should not be explicitly set or changed, and the menu should not be anchored at both its top and bottom edges, else the menu will no longer open and close correctly.
In the example is only the width of the ListItem set. )

[s710]

Thanks, worked. Was not that clever to put size information on the item anyway.