Investigate issue with dynamic sheets

SheetTestPage.qml
--------------------------------------
import bb.cascades 1.0

Page {
    id: page

    titleBar: TitleBar {
        title: root.activeTab.title
    }

    property variant theSheet

    signal signalToSheet()

    Container {
        Button {
            text: "Open Sheet"
            onClicked: {
                theSheet = sheetDef.createObject();

                theSheet.sheetSignal.connect(onSheetSignal);
                signalToSheet.connect(theSheet.onSignalToSheet);
                theSheet.closeSheet.connect(onCloseSheet);

                theSheet.open();
            }
        }
    }

    attachedObjects: [
        ComponentDefinition {
            id: sheetDef
            source: "SheetTest.qml"
        }
    ]

    function onSheetSignal() {
        print('got sheet signal');
        signalToSheet();
    }

    function onCloseSheet() {
        print('got close sheet');

        theSheet.sheetSignal.disconnect(onSheetSignal);
        signalToSheet.disconnect(theSheet.onSignalToSheet);
        theSheet.closeSheet.disconnect(onCloseSheet);

        print('closing');
        theSheet.close();

        print('destroying');
        theSheet.destroy();

        print('destroyed');
    }
}


SheetTest.qml
---------------
import bb.cascades 1.0

Sheet {
    signal sheetSignal()
    signal closeSheet()

    content: Page {
        Container {
            Button {
                text: "Send Signal"
                onClicked: {
                    sheetSignal();
                }
            }

            Button {
                text: "Close Sheet"
                onClicked: {
                    print('sending closeSheet');
                    closeSheet();
                    print('sent closeSheet');
                }
            }
        }
    }

    function onSignalToSheet() {
        print('got signal to sheet');
    }
}