DockablePane myDockablePane = null; myDockablePane = uiApp.GetDockablePane(new Guid("9f795002-779d-4f76-aa1b-6a943378f64d"));
DockablePane dPane = uiApp.GetDockablePane(dockablePaneId); if (null != dPane) { dPane.Show(); }This example code retrieves the specified dockable pane and then shows it if it's not null. Package/library: Autodesk.Revit.UI.dll