- adding Hidden method to ControlBase which will be called on leaving form or on opening a modal one

TelegramBotBase/Base/ControlBase.cs

@@ -51,6 +51,12 @@ namespace TelegramBotBase.Base
 
 
 
+        }
+
+        public virtual async Task Hidden(bool FormClose)
+        {
+
+
         }
 
         public virtual async Task Cleanup()

TelegramBotBase/Base/FormBase.cs

@@ -290,6 +290,15 @@ namespace TelegramBotBase.Form
             newForm.Client = this.Client;
             newForm.Device = ds;
 
+            //Notify prior to close
+            foreach (var b in this.Controls)
+            {
+                if (!b.Enabled)
+                    continue;
+
+                await b.Hidden(true);
+            }
+
             this.CloseControls().Wait();
 
             await this.OnClosed(new EventArgs());
@@ -325,6 +334,14 @@ namespace TelegramBotBase.Form
                 await CloseModal(newForm, parentForm);
             };
 
+            foreach (var b in this.Controls)
+            {
+                if (!b.Enabled)
+                    continue;
+
+                await b.Hidden(false);
+            }
+
             await newForm.OnInit(new InitEventArgs(args));
 
             await newForm.OnOpened(new EventArgs());