API for Other UI elements
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§Status Bar
§Tray
§ Explore Autodesk.AutoCAD.Windows namespace
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§Showing Modal and ModelessDialogs
§Application.ShowModalDialog
§Application.ShowModelessDialog
§Persists size and position automatically
The AutoCAD .NET API also supports the status bar and the tray. To see the classes for these elements see the Autodesk.AutoCAD.Windows namespace. Also if you are going to be using dialogs be sure to use the ShowModalDialog and ShowModelessDialog of the Application. Using the standard "ShowDialog" or "Show" methods to display .NET modal (or modeless) forms can cause AutoCAD to  freeze or cause some other unwanted behaviour.