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DockablePaneProviderData.InitialState

Property
Description:
The initial position of the docking pane.
Remarks:
This position will be used for the first Revit session in which the pane is registered; afterwards, the user is free to reposition the pane, and the user's saved position will be remembered in future sessions.
Syntax
public DockablePaneState InitialState { get; set; }