You can use the component locator to identify components and to find their code when running applications in development mode. The component locator opens the corresponding source code in your IDE when you click a component (for example, a Button in a view).
Start by running your Vaadin application project in development mode. Click on the Vaadin symbol }> at the bottom right-hand corner of your browser window — as indicated in the screenshot here.
Next, go to the Code tab from the menu (see screenshot) and click on Find component in code to initialize the Component Locator.
Now that the Component Locator has been enabled, you’re ready to use it. To highlight a component in red and identify it, hover your pointer over one in the view. The component names appear in a list at the bottom right-hand corner of your browser window. You can use the arrow keys to navigate that list.
Finally, click on the highlighted component to open the relevant source code in your IDE, as you can see in the screenshot here: