添加项目文件。

Sai.RvKits/RvView/ElementsControlCmd.cs

@@ -0,0 +1,30 @@
+using Autodesk.Revit.Attributes;
+using Autodesk.Revit.UI;
+
+using Nice3point.Revit.Toolkit.External;
+
+namespace Sai.RvKits.RvView;
+
+[Transaction(TransactionMode.Manual)]
+[Regeneration(RegenerationOption.Manual)]
+[Journaling(JournalingMode.NoCommandData)]
+public class ElementsControlCmd : ExternalCommand
+{
+    public override void Execute()
+    {
+        var isExist = DockablePane.PaneExists(Variables.PaneId);
+        var isRegistered = DockablePane.PaneIsRegistered(Variables.PaneId);
+        if (isRegistered && isExist)
+        {
+            var pane = UiApplication.GetDockablePane(Variables.PaneId);
+            if (pane.IsShown())
+            {
+                pane.Hide();
+            }
+            else
+            {
+                pane.Show();
+            }
+        }
+    }
+}