When a DockPanel
it is not removed from DockingManager
window is removed from the DockingManager
and the state of the closed DockPanel
changes to Hidden
.In order to use the DockingManager with the TdiContainerVisible property set to false, you must change the value of the DockState property to values different from TabbedDocument for all DockPanels. The mode specified by the TdiContainerVisible = false will only work correctly only when all TabbedDocument panels such as DocumentPane are closed.
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the Telerik team