function findUp(oControl) {
			if (oControl) {
				if (oControl.isA(sClassName)) {
					return oControl;
				} else {
					return findUp(oControl.getParent());
				}
			}
		}
Looks for an instance of a specified type up to hierarchy. If instance is a of specified type,
then this instance will be returned, otherwise ascendants will be checked one by one. If no
instance of a specified type is found, then `undefined` is returned.

@param {sap.ui.base.ManagedObject} oControl - Control to start search from
@param {string} sClassName - Class name to look for, e.g. sap.ui.integration.baseEditor.BaseEditor
@returns {sap.ui.base.ManagedObject|undefined} - `undefined` if there is no control of a type in hierarchy

@function
@experimental
@private