The **Application Event Types** property allows developers to define and configure custom application-level events that can be triggered and handled throughout the solution. This provides a way to centralize and standardize custom event names, signatures, and documentation.
These events are programmatically referenced using the [eventsManager](/reference/servoycore/dev-api/events-manager.md#events-manager) API or similar mechanisms, making the solution more maintainable and consistent.
## Accessing the Editor
1. In the [Solution Explorer](/reference/servoy-developer/solution-explorer.md#solution-explorer), click on the solution name (e.g., `mySolutionLess`).
2. In the **Properties view**, find the [eventTypes](/reference/servoycore/object-model/solution.md#eventtypes) property.
3. Click on the property's value field to open the [Application Event Types Editor](#overview).
## Sections: Editor Structure
### Event Type List (Left Panel)
* Displays all defined custom event types in a vertical list.
* Each event is identified by its unique name.
* The list also shows a small **Delete icon** next to each event, allowing quick removal.
### Event Type Signature Properties (Right Panel)
When an event type is selected from the left panel, the right side shows its configurable signature properties:
* **UI Event**
* A dropdown to optionally classify the event in relation to UI contexts (e.g., `Form`).
* **Description**
* A multi-line text area for documenting the purpose, intended use, or behavior of the event.
* **Return Type**
* A dropdown to optionally specify the return type of handlers for this event.
* A small adjacent field to further describe what the return type means.
* **Arguments**
* Displays a list of arguments that the event will pass when fired. Each row shows:
* **Name**: The argument name.
* **Type**: The argument type (e.g., `JSEvent`).
* Includes an `Add Argument` button below to add new arguments.
## Sections: Buttons and UI Elements
### Per-Event Buttons
* 🗑️ **Delete**: Appears next to each event type in the left panel. Removes the selected event from the list.
### Global Buttons
* **Add New Event Type**: Opens a dialog to create a new event type by specifying its name.
* **Event Name**: Text input for the new event's identifier.
* **OK**: Confirms and adds the new event type.
* **Cancel**: Closes the dialog without adding.
* **OK** (footer of the editor): Saves all changes and closes the editor.
* **Cancel** (footer of the editor): Discards any unsaved changes and closes the editor.
## Using the Application Event Types Editor
Here are the steps for using the **Application Event Types Editor**:
1. **Open the Event Types Editor**
* Go to the [Solution Explorer](/reference/servoy-developer/solution-explorer.md#solution-explorer).
* Click your solution name and locate the [eventTypes](/reference/servoycore/object-model/solution.md#eventtypes) property in the Properties view.
* Click the property's value field to open the editor.
2. **Add a New Event Type**
* Click `Add New Event Type` button.
* Enter a unique event name in the prompt.
* Click `OK`. The new event appears in the list.
3. **Configure Event Signature Properties**
* Select an event in the left panel to edit its details on the right.
* Choose a `UI Event` type from the dropdown if applicable.
* Fill in the `Description` to explain the purpose of the event.
* Select a `Return Type` from the dropdown and add a short explanation.
* Click `Add Argument` button to define arguments that handlers will receive. Enter their `Name` and `Type`.
4. **Delete an Event**
* Click the 🗑️ `Delete` icon next to the event you wish to remove.
5. **Save or Cancel**
* Click `OK` to apply all changes and close the editor.
* Click `Cancel` to discard any changes.
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