Add basic ECS classes - resolve conflicts - add child controls back in

Author: John Ludlow

Local/UserInterface/ImGuiSample/UserInterface/Controls/TestWindow.cs

@@ -4,8 +4,8 @@ public class TestWindow : BaseWindow
 {
     public TestWindow() : base("Test Window")
     {
-        Controls.Add(new ImGuiPanel("Panel 1"));
-        Controls.Add(new ImGuiPanel("Panel 2"));
-        Controls.Add(new ImGuiPanel("Panel 3"));
+        Controls.Add(new ImGuiPanel("Panel 1") { Controls = { new TextControl { Text = "This is some text inside Panel 1." } } });
+        Controls.Add(new ImGuiPanel("Panel 2") { Controls = { new TextControl { Text = "This is some text inside Panel 2." } } });
+        Controls.Add(new ImGuiPanel("Panel 3") { Controls = { new TextControl { Text = "This is some text inside Panel 3." } } });
     }
 }