fix RadButtonItem -=> RadButtonElement

Pilz.Plugins.Advanced.UI.Telerik/Extensions.cs

@@ -34,9 +34,10 @@ public static class Extensions
 
     public static RadButtonItem GetAsItem(this PluginFeature module, EventHandler? clickHandler, PluginButtonType buttonType = PluginButtonType.RadMenuItem)
     {
-        var item = buttonType switch
+        RadButtonItem item = buttonType switch
         {
             PluginButtonType.RadMenuItem => new RadMenuItem(),
+            PluginButtonType.RadButtonElement => new RadButtonElement(),
             PluginButtonType.RadButtonItem => new RadButtonItem(),
             _ => throw new NotSupportedException(),
         };

Pilz.Plugins.Advanced.UI.Telerik/PluginButtonType.cs

@@ -3,5 +3,6 @@
 public enum PluginButtonType
 {
     RadMenuItem,
+    RadButtonElement,
     RadButtonItem,
 }