RichTextEditor: Scrollbar offset is not reset when you resize the control until the scrollbars disappear

Progress® Telerik® UI for WinForms Feedback Portal

Create an account Log In

Back to Feed

Request a Feature Report a Bug

Unplanned

Last Updated: 15 Jul 2026 07:53 by Martin Ivanov

Martin Ivanov

Created on: 15 Jul 2026 07:53

Category: RichTextEditor

Type: Bug Report

RichTextEditor: Scrollbar offset is not reset when you resize the control until the scrollbars disappear

The vertical and horizontal scrollbar positions get cached during scrolling. If you scroll around and then resize the RadRichTextEditor so that the scrollbars are no longer needed and then you resize the editor again to show the scrollbars, the cached position is used, instead of resetting it to 0,0.

This reproduces when the LayoutMode of the editor i set to FlowNoWrap.

To work this around, reset the scrollbars' Value to 0 on SizeChanged.

private void RadRichTextEditor1_SizeChanged(object sender, EventArgs e)
{
    Normalize(radRichTextEditor1.RichTextBoxElement.VerticalScrollBar);
    Normalize(radRichTextEditor1.RichTextBoxElement.HorizontalScrollBar);
}

private static void Normalize(RadScrollBarElement sb)
{
    int maxUser = Math.Max(sb.Minimum, sb.Maximum - sb.LargeChange + 1);

    if (sb.Visibility != ElementVisibility.Visible)
    {
        sb.Value = sb.Minimum;   
        return;
    }

    if (sb.Value > maxUser)
    {
        sb.Value = maxUser;
    }
}