/// <summary>
/// Enables scrolling the given <paramref name="control"/> vertically with the
/// <kbd>Up</kbd>, <kbd>Down</kbd>, <kbd>Page Up</kbd>, and <kbd>Page Down</kbd> keys.
/// </summary>
/// <param name="control">
/// A scrollable control that requires keyboard support for vertical scrolling.
/// </param>
public static void EnableVerticalKeyboardScroll(this ScrollableControl control)
{
KeyEventHandler onKeyDown = (sender, args) => OnKeyDown(control, args);
var form = control.FindForm();
if (form == null)
{
control.KeyDown += onKeyDown;
return;
}
form.KeyPreview = true;
form.KeyDown += onKeyDown;
}