Added new kb article scrollablepanel-prevent-scrollbars-moving

Author: KB Bot

knowledge-base/scrollablepanel-prevent-scrollbars-moving.md

@@ -0,0 +1,82 @@
+---
+title: Preventing Scrollbars from Moving When Clicking on the ScrollablePanel
+description: Learn how to stop the automatic scrolling behavior of RadScrollablePanel to the focussed control inside.
+type: how-to
+page_title: How to Stop Scrollbars from Moving in RadDock for WinForms Windows
+slug: scrollablepanel-prevent-scrollbars-moving
+tags: panelsandlabels, scrollbar, auto-scroll, custom-class
+res_type: kb
+ticketid: 1663867
+---
+
+## Environment
+
+|Product Version|Product|Author|
+|----|----|----|
+|2024.3.806|RadGridView for WinForms|[Dinko Krastev](https://www.telerik.com/blogs/author/dinko-krastev)|
+
+## Description
+When clicking on the content of the RadScrollablePanel, the scrollbars automatically move to make the focused control visible. This behavior is due to the `RadScrollablePanel` automatically scrolling to the active control. The goal is to disable this automatic scrolling behavior so that the scrollbars do not move when a window is clicked.
+
+## Solution
+To prevent the scrollbars from moving when clicking on a window, you need to override the `ScrollToControl` method of the `RadScrollablePanelContainer`. This involves creating a custom class that derives from `RadScrollablePanelContainer` and then using this custom container in your `RadScrollablePanel`.
+
+First, create a custom `RadScrollablePanelContainer`:
+
+````C#
+public class MyRadScrollableContainer : RadScrollablePanelContainer
+{
+    private RadScrollablePanel myParentPanel;
+
+    public MyRadScrollableContainer() : base(null)
+    {
+    }
+
+    public MyRadScrollableContainer(RadScrollablePanel parentPanel) : base(parentPanel) 
+    {
+        this.DoubleBuffered = true;
+        this.SetStyle(ControlStyles.Selectable, true);
+        this.myParentPanel = parentPanel;
+    }
+
+    protected override Point ScrollToControl(Control activeControl)
+    {
+        Point result = Point.Empty;
+        if (myParentPanel != null)
+        {
+            result = new Point(-this.myParentPanel.HorizontalScrollbar.Value, -this.myParentPanel.VerticalScrollbar.Value);
+        }
+        return result;
+    }
+}
+
+````
+
+Then, create a custom `RadScrollablePanel` that uses your custom container:
+
+````C#
+public class CustomRadScrollablePanel : RadScrollablePanel
+{
+    protected override RadScrollablePanelContainer CreateScrollablePanelContainer()
+    {
+        return new MyRadScrollableContainer(this);
+    }
+
+    public override string ThemeClassName
+    {
+        get
+        {
+            return typeof(RadScrollablePanel).FullName;
+        }
+    }
+}
+
+````
+
+Finally, replace the default `RadScrollablePanel` with your custom version in the applicable part of your application, such as the `OnWindowCreate()` method.
+
+By implementing this custom container, you disable the default behavior that automatically scrolls to the active control, thus preventing the scrollbars from moving when a window is clicked.
+
+## See Also
+- [RadDock Overview](https://docs.telerik.com/devtools/winforms/controls/dock/overview)
+- [Customizing RadScrollablePanel Behavior](https://docs.telerik.com/devtools/winforms/controls/panels/scrollable-panel/customizing-behavior)