DataGridViewのスクロールバーを有効にする(WinForms)

DataGridView1.Controls[0].Enabled = true; // Index zero is the horizontal scrollbar
DataGridView1.Controls[1].Enabled = true; // Index one is the vertical scrollbar

DataGridView Vertical Scroll is disabled.
https://social.msdn.microsoft.com/Forums/windows/en-US/bbf96688-76b2-4676-9f92-110e909faee1/datagridview-vertical-scroll-is-disabled?forum=winformsdesigner