Running MaintenanceTool with updater script does not react to cancel events

function Controller() {
    installer.autoRejectMessageBoxes();
    installer.installationFinished.connect(function() {
        installer.executeDetached("@TargetDir@/MyApp.exe", [], "@TargetDir@");
        gui.clickButton(buttons.FinishButton);
    })
}

Controller.prototype.WelcomePageCallback = function() {
    gui.clickButton(buttons.NextButton);
}

Controller.prototype.CredentialsPageCallback = function() {
    gui.clickButton(buttons.NextButton);
}

Controller.prototype.IntroductionPageCallback = function() {
    gui.clickButton(buttons.NextButton);
}

Controller.prototype.ComponentSelectionPageCallback = function() {
    var widget = gui.currentPageWidget();

    gui.clickButton(buttons.NextButton);
}

Controller.prototype.ReadyForInstallationPageCallback = function()
{
    gui.clickButton(buttons.NextButton);
}

Controller.prototype.FinishedPageCallback = function() {
    gui.clickButton(buttons.FinishButton);
}