qt - emit qml signal on start application -

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Is there a way to emit or is there a signal that emits in the beginning of an application in qml?

My purpose is to check the weather that some values ​​are in the list and when, I want to enable a button

Something like this: 

 < Code> rectangle {id: main button {id: myButton checkable: false onClicked: {/ * something}} // first version connection: {target: myClass onSignalEmit () {myButton.checkable = true}} / / second Start the Wursat emission ()}

As @ rated ninja said that you Can use components. Then complete in this case 

  rectangle {id: main .... element. : start up(); }

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