function _getModel(oControl) {
		if (oControl) {
			var oModel = oControl.getModel ? oControl.getModel() : null;

			if (_getProtocolType(oModel)) {
				return oModel;
			}

			Log.warning("Unsupported model type or protocol");
			return null;
		}

		Log.warning("No Control passed");
		return null;
	}
Get the model of a control

@private
@param {sap.ui.base.ManagedObject} oControl - Control to add extensions
@returns {string} <code>mProtocolType.v2</code>, <code>mProtocolType.v4</code> or <code>null</code>