# Collapsible and Expandable Panels ## Content The panels in [C1SplitContainer](/componentone/docs/win/online-splitcontainer/) can easily be collapsed or expanded by setting the [Collapsible](/componentone/docs/win/online-splitcontainer/) property to **True** (see [Adding a ToolTip to the Collapsed Splitter Panel](/componentone/docs/win/online-splitcontainer/splitcontainerforwin3/settingc1splitcontai/addingatooltiptothec)). Once the property is set, you can click on the expander button to collapse or expand the panels. The following image illustrates Panel1's Collapsible property set to **True**:
![](https://cdn.mescius.io/document-site-files/images/91a148ff-850c-4b63-a7b5-d269cf16bcf7/imagesext/image12_29.png) When the Collapsible property is set to **True** you can enter text for the collapsed or collapsing tooltip using the [CollapsedToolTip](/componentone/docs/win/online-splitcontainer/) and [CollapsingToolTip](/componentone/docs/win/online-splitcontainer/) properties. The following image shows the default tooltip when you hover over the expanded button:
![](https://cdn.mescius.io/document-site-files/images/91a148ff-850c-4b63-a7b5-d269cf16bcf7/imagesext/image12_30.png) When you hover over the expander button of a minimized panel the default tooltip text will read, expand panel. ## See Also [SplitterPanel Scrolling](/componentone/docs/win/online-splitcontainer/splitterpanelbehavio/splitterpanelscrolli)