if (this.element && this.element.au && this.element.au.controller && typeof (this.element.au.controller) === 'object' && this.element.au.controller.viewModel && typeof (this.element.au.controller.viewModel) === 'object') {
        this.elementVM = this.element.au.controller.viewModel;
        //check whether this.elementVM has changesrc function - to be called in event listener
        //this.isReadMDCustomElement = (typeof this.elementVM.changesrc === 'function');
    } else {console.warn('element viewmodel object doesnot exists, cant be called by handleXXX methods')}