Open a secondary window ans sent messages to it

[SteMMo]

Hi all,
I need to create a main window and together a secondary window, both visible.
The main window contains some controls (buttons and up/down control): when the user presses one of these control I need to send a 'message' to the secondary window that will update some text content.
First problem is to create the window: when I can create it?
How?
So far I'm trying to create it on a click of my custom control:

ApplicationWindow {
    id: root
    visible: true
    width: 640
    height: 480
    title: qsTr("Baseball Table")

    property var win;

    MainForm {

        anchors.fill: parent

        upDownStrike.onPressedUp: {
            console.log("Strk+")
            var component = Qt.createComponent("qrc:/Table.qml");
            root.win = component.createObject(root);
            if (root.win){
                root.win.show();
            }
        }

        upDownStrike.onPressedDown: console.log("Strk-")
    }

This way I receive the error:

qml: Strk+
QQmlComponent: Component is not ready

so the event is triggered but there is something wrong in my (simple) code.
Which type the Secondary window should be? Item ? ApplicationWindow ?

Once created the window, how can i send some message/information to secondary window?

Thanks!

[SteMMo]

Solved!
In the Table.qml header there was a missing include file.
Quite annoying: why this error was not shown before 'Component is not ready' message?

I found it including the object defined in the Table.qml directly in the main file.

[GrecKo]

You can check the status of component with its status property and the errorString() method.