code: function(oOverlay) {
  			return {
  				asSibling: this._isEditableCheck.call(this, oOverlay, true),
  				asChild: this._isEditableCheck.call(this, oOverlay, false)
  			};
  		}
docs: This function gets called on startup. It checks if the Overlay is editable by this plugin.
  @param {sap.ui.dt.Overlay} oOverlay - overlay to be checked
  @returns {object} Returns object with editable boolean values for "asChild" and "asSibling"
  @protected