event for ui creation

Pilz.Plugins.Advanced/PluginModule.cs

@@ -8,6 +8,13 @@ namespace Pilz.Plugins.Advanced
 {
     public abstract class PluginModule : PluginFeature
     {
+        public delegate void PluginModuleUIEventHandler(PluginModule module, PluginModuleUI ui);
+
+        /// <summary>
+        /// Fires when a <see cref="PluginModuleUI"/> instance has been created.
+        /// </summary>
+        public static event PluginModuleUIEventHandler? OnUICreated;
+
         public bool Visible { get; set; } = true;
         public bool AllowEmbedding { get; set; } = true;
 
@@ -26,7 +33,9 @@ namespace Pilz.Plugins.Advanced
 
         public virtual PluginModuleUI CreateUI()
         {
-            return CreateNewUI();
+            var ui = CreateNewUI();
+            OnUICreated?.Invoke(this, ui);
+            return ui;
         }
 
         protected abstract PluginModuleUI CreateNewUI();