src/sap.ui.rta/src/sap/ui/rta/plugin/additionalElements/AdditionalElementsPlugin.js
function (oEvent) {
			// open field ext ui
			var oUshellContainer = FlUtils.getUshellContainer();
			var oCrossAppNav = oUshellContainer.getService("CrossApplicationNavigation");
			var sHrefForFieldExtensionUi = (oCrossAppNav && oCrossAppNav.hrefForExternal({
				target : {
					semanticObject : "CustomField",
					action : "develop"
				},
				params : {
					businessContexts : this._oCurrentFieldExtInfo.BusinessContexts.map( function( oBusinessContext){
						return oBusinessContext.BusinessContext;
					}),
					serviceName : this._oCurrentFieldExtInfo.ServiceName,
					serviceVersion : this._oCurrentFieldExtInfo.ServiceVersion,
					entityType : this._oCurrentFieldExtInfo.EntityType
				}
			}));
			Utils.openNewWindow(sHrefForFieldExtensionUi);
		}
function (oEvent) {
			// open field ext ui
			var oUshellContainer = FlUtils.getUshellContainer();
			var oCrossAppNav = oUshellContainer.getService("CrossApplicationNavigation");
			var sHrefForFieldExtensionUi = (oCrossAppNav && oCrossAppNav.hrefForExternal({
				target : {
					semanticObject : "CustomField",
					action : "develop"
				},
				params : {
					businessContexts : this._oCurrentFieldExtInfo.BusinessContexts.map( function( oBusinessContext){
						return oBusinessContext.BusinessContext;
					}),
					serviceName : this._oCurrentFieldExtInfo.ServiceName,
					serviceVersion : this._oCurrentFieldExtInfo.ServiceVersion,
					entityType : this._oCurrentFieldExtInfo.EntityType
				}
			}));
			Utils.openNewWindow(sHrefForFieldExtensionUi);
		}
function ( oEvent ) { // open field ext ui var oUshellContainer = FlUtils . getUshellContainer ( ) ; var oCrossAppNav = oUshellContainer . getService ( "CrossApplicationNavigation" ) ; var sHrefForFieldExtensionUi = ( oCrossAppNav && oCrossAppNav . hrefForExternal ( { target : { semanticObject : "CustomField" , action : "develop" } , params : { businessContexts : this . _oCurrentFieldExtInfo . BusinessContexts . map ( function ( oBusinessContext ) { return oBusinessContext . BusinessContext ; } ) , serviceName : this . _oCurrentFieldExtInfo . ServiceName , serviceVersion : this . _oCurrentFieldExtInfo . ServiceVersion , entityType : this . _oCurrentFieldExtInfo . EntityType } } ) ) ; Utils . openNewWindow ( sHrefForFieldExtensionUi ) ; }
Function called when custom field button was pressed

@param {sap.ui.base.Event}
oEvent event object
Function called when custom field button was pressed