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 End-User Documentation

DockManager.ClosingPanel Event

Occurs when a panel is closing.

Namespace:DevExpress.XtraBars.Docking
Assembly:DevExpress.XtraBars.v17.1.dll

Expanded Syntax

Expanded Event Data

The event handler receives an argument of type DockPanelCancelEventArgs containing data related to this event.

The following DockPanelCancelEventArgs properties provide information specific to this event.
Property Description
Cancel Gets or sets whether the operation performed on the processed panel should be cancelled.
Panel Gets the processed dock panel.

Expanded Remarks

The ClosingPanel event is fired when a panel is about to be closed. This event occurs for any of the following cases:

  • an end-user has pressed a panel's Close button;
  • the DockPanel.Close method is called.
This event allows you to prevent a specific panel from being closed or to perform specific actions on the panel (for instance dock a panel to a specific position instead of having it closed). To prevent the panel from being closed the event's DockPanelCancelEventArgs.Cancel parameter must be set to true. The processed panel is specified by the event's DockPanelEventArgs.Panel parameter.

The panel will be closed if the Cancel parameter is set to false. Closing a panel doesn't destroy it instead it simply hides it, the panel's DockPanel.Visibility property will be set to DockVisibility.Hidden and the panel will be moved to the HiddenPanels collection.

After a panel has been closed the ClosedPanel event is fired.

It's also possible to prevent a user from closing panels by hiding their Close buttons via the BaseDockOptions.ShowCloseButton property.

Expanded Example

In the following example the ClosingPanel event is handled to override the default behavior of the panel when it is closed. The panel being closed will be docked to the bottom edge of the form and its auto-hide functionality will be enabled.

Expanded See Also

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