WorkbenchPopup (UberFire Client API 7.73.0.Final API)

```
@Inherited
@Retention(RUNTIME)
@Target(TYPE)
public @interface WorkbenchPopup
```
Classes annotated with this are considered Workbench popups.
At its simplest form the Class should extend com.google.gwt.user.client.ui.PopupPanel and provide a method annotated with @OnOpen.

Developers wishing to separate view from logic (perhaps by implementing the MVP pattern) can further provide a zero-argument method annotated with @WorkbenchPartView with return type com.google.gwt.user.client.ui.PopupPanel.

In this latter case the @WorkbenchPopup need not extend com.google.gwt.user.client.ui.PopupPanel.

WorkbechPopups can receive the following life-cycle calls:
- @OnOpen

- Required Element Summary
  
  Required Elements
  Modifier and Type Required Element Description
  
  String identifier
- Optional Element Summary
  
  Optional Elements
  Modifier and Type Optional Element Description
  
  WorkbenchPopup.WorkbenchPopupSize size

- Element Detail
  - identifier
```
String identifier
```
- - size
```
WorkbenchPopup.WorkbenchPopupSize size
```
    Default:
    
    org.uberfire.client.annotations.WorkbenchPopup.WorkbenchPopupSize.MEDIUM