Slider showcase and bugfixes in designer

Showcase/Slider.cs

@@ -0,0 +1,20 @@
+
+//------------------------------------------------------------------------------
+
+//  <auto-generated>
+//      This code was generated by:
+//        TerminalGuiDesigner v2.0.0.0
+//      You can make changes to this file and they will not be overwritten when saving.
+//  </auto-generated>
+// -----------------------------------------------------------------------------
+namespace Showcase {
+    using Terminal.Gui;
+
+
+    public partial class Slider {
+
+        public Slider() {
+            InitializeComponent();
+        }
+    }
+}

src/Design.cs

@@ -225,6 +225,13 @@ public Design CreateSubControlDesign(string name, View subView)
             tf.KeyDown += SuppressNativeKeyboardEvents;
         }
 
+        if (subView.GetType().IsGenericType(typeof(Slider<>)))
+        {
+            // TODO: Does not seem to work
+            subView.MouseEvent += (s, e) => SuppressNativeClickEvents(s, e,true);
+            subView.MouseClick += (s, e) => SuppressNativeClickEvents(s,e, true);
+        }
+
         if (subView is TreeView tree)
         {
             tree.AddObject(new TreeNode("Example Branch 1")