From 4e0f4999a00480fe5fffed31a04f62d9485a49c0 Mon Sep 17 00:00:00 2001
From: Pilzinsel64 <pascal.schedel@dr-schneider.com>
Date: Tue, 7 Oct 2025 14:52:53 +0200
Subject: [PATCH] enure handle created on load data complete

---
 .../Dialogs/RadFlyoutBase.cs                  | 39 ++++++++++++++++---
 1 file changed, 34 insertions(+), 5 deletions(-)

diff --git a/Pilz.UI.WinForms.Telerik/Dialogs/RadFlyoutBase.cs b/Pilz.UI.WinForms.Telerik/Dialogs/RadFlyoutBase.cs
index f78c06a..6f95de4 100644
--- a/Pilz.UI.WinForms.Telerik/Dialogs/RadFlyoutBase.cs
+++ b/Pilz.UI.WinForms.Telerik/Dialogs/RadFlyoutBase.cs
@@ -8,6 +8,7 @@ namespace Pilz.UI.WinForms.Telerik.Dialogs;
 public partial class RadFlyoutBase : UserControl
 {
     private bool addedControlsToUi;
+    private RunWorkerCompletedEventArgs loadDataEventArgs;
 
     protected RadButton radButton_Cancel;
     protected RadButton radButton_Confirm;
@@ -34,6 +35,9 @@ public partial class RadFlyoutBase : UserControl
     [DefaultValue(true)]
     public bool RegisterDialogCancel { get; set; } = true;
 
+    [DefaultValue(true)]
+    public bool EnsureHandleOnDataLoadComplete { get; set; } = true;
+
     public new Size PreferredSize { get; set; } = Size.Empty;
 
     [DefaultValue(true)]
@@ -113,7 +117,6 @@ public partial class RadFlyoutBase : UserControl
     protected RadFlyoutBase()
     {
         InitializeComponent();
-        ParentChanged += FlyoutDialogBase_ParentChanged;
         bgWorker_LoadData.DoWork += BgWorker_LoadData_DoWork;
         bgWorker_LoadData.RunWorkerCompleted += BgWorker_LoadData_RunWorkerCompleted;
     }
@@ -125,10 +128,17 @@ public partial class RadFlyoutBase : UserControl
 
     protected virtual void BgWorker_LoadData_RunWorkerCompleted(object? sender, RunWorkerCompletedEventArgs e)
     {
-        if (InvokeRequired)
-            BeginInvoke(() => OnLoadDataCompleted(e));
+        loadDataEventArgs = null;
+
+        if (!EnsureHandleOnDataLoadComplete || IsHandleCreated)
+        {
+            if (InvokeRequired)
+                BeginInvoke(() => OnLoadDataCompleted(e));
+            else
+                OnLoadDataCompleted(e);
+        }
         else
-            OnLoadDataCompleted(e);
+            loadDataEventArgs = e;
     }
 
     protected virtual void LoadData()
@@ -236,6 +246,19 @@ public partial class RadFlyoutBase : UserControl
         tableLayoutPanel_ActionPanel.ResumeLayout(false);
     }
 
+    protected override void OnHandleCreated(EventArgs e)
+    {
+        base.OnHandleCreated(e);
+
+        if (EnsureHandleOnDataLoadComplete && loadDataEventArgs != null)
+        {
+            if (InvokeRequired)
+                BeginInvoke(() => OnLoadDataCompleted(loadDataEventArgs));
+            else
+                OnLoadDataCompleted(loadDataEventArgs);
+        }
+    }
+
     protected override void OnLoad(EventArgs e)
     {
         if (!addedControlsToUi && !DesignMode)
@@ -253,7 +276,13 @@ public partial class RadFlyoutBase : UserControl
         base.OnLoad(e);
     }
 
-    protected virtual void FlyoutDialogBase_ParentChanged(object? sender, EventArgs e)
+    protected override void OnParentChanged(EventArgs e)
+    {
+        base.OnParentChanged(e);
+        HandleOnParentChanged(e);
+    }
+
+    protected virtual void HandleOnParentChanged(EventArgs e)
     {
         var frm = FindForm();