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basic_action_system.md: link to popups

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topics/basics/basic_action_system.md
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@ -378,6 +378,7 @@ Two steps are required to register an action from code:
If a plugin needs to include a toolbar or popup menu built from a group of actions in its user interface, that is achieved through [`ActionPopupMenu`](%gh-ic%/platform/editor-ui-api/src/com/intellij/openapi/actionSystem/ActionPopupMenu.java) and [`ActionToolbar`](%gh-ic%/platform/editor-ui-api/src/com/intellij/openapi/actionSystem/ActionToolbar.java). If a plugin needs to include a toolbar or popup menu built from a group of actions in its user interface, that is achieved through [`ActionPopupMenu`](%gh-ic%/platform/editor-ui-api/src/com/intellij/openapi/actionSystem/ActionPopupMenu.java) and [`ActionToolbar`](%gh-ic%/platform/editor-ui-api/src/com/intellij/openapi/actionSystem/ActionToolbar.java).
These objects can be created through calls to the `ActionManager.createActionPopupMenu()` and `createActionToolbar()` methods. These objects can be created through calls to the `ActionManager.createActionPopupMenu()` and `createActionToolbar()` methods.
To get a Swing component from such an object, call the respective `getComponent()` method. To get a Swing component from such an object, call the respective `getComponent()` method.
See also [](popups.md#action-groups) for more advanced popups.
If an action toolbar is attached to a specific component (for example, a panel in a tool window), call `ActionToolbar.setTargetComponent()` and pass the related component's instance as a parameter. If an action toolbar is attached to a specific component (for example, a panel in a tool window), call `ActionToolbar.setTargetComponent()` and pass the related component's instance as a parameter.
Setting the target ensures that the toolbar buttons' state depends on the state of the related component, not on the current focus location within the IDE frame. Setting the target ensures that the toolbar buttons' state depends on the state of the related component, not on the current focus location within the IDE frame.