# Miscellaneous Swing Components Overview of useful Swing components provided by IntelliJ Platform. ### Messages The [`Messages`](%gh-ic%/platform/platform-api/src/com/intellij/openapi/ui/Messages.java) class provides a way to show simple message boxes, input dialogs (modal dialogs with a text field), and chooser dialogs (modal dialogs with a combo box). The function of different methods of the class should be clear from their names. When running on macOS, the message boxes shown by the `Messages` class use the native UI. The `showCheckboxMessageDialog()` function provides an easy way to implement a _Do not show this again_ checkbox on messages. Note that it is recommended to use non-modal notifications instead of modal message boxes whenever it's appropriate. Please refer to the [Notifications](notifications.md) topic for more information. ### JBSplitter The [`JBSplitter`](%gh-ic%/platform/platform-api/src/com/intellij/ui/JBSplitter.java) class is JetBrains' replacement for the standard [`JSplitPane`](https://docs.oracle.com/javase/8/docs/api/javax/swing/JSplitPane.html) class. Unlike some other JetBrains-enhanced Swing components, it's not a drop-in replacement and has a different API. However, to achieve a consistent user experience, it's recommended to use `JBSplitter` instead of the standard `JSplitPane`. To add components to the splitter, call the `setFirstComponent()` and `setSecondComponent()` methods. `JBSplitter` supports automatic remembering of the split proportion. To enable it, call the `setSplitterProportionKey()` method and pass the ID under which the proportion will be stored. ### JBTabs The [`JBTabs`](%gh-ic%/platform/platform-api/src/com/intellij/ui/tabs/JBTabs.java) class is JetBrains' implementation of the tab control, used for editor tabs and a few other components. It has a significantly different look & feel compared to the standard Swing tabs, and looks less native on the macOS platform, so it's up to the developer to choose which tab control would be more appropriate. ### Toolbars See [Toolbar](https://jetbrains.design/intellij/controls/toolbar/) in the IntelliJ Platform UI Guidelines for an overview. [Building UI from Actions](basic_action_system.md#building-ui-from-actions) covers creating `AnAction`-based toolbars.