VB.NET：DataGridView显示2个按钮，而不是仅显示1个

Question

即使我仅初始化1个按钮，我也无法摆脱DataGridView中的第二个按钮。

Dim btn As New DataGridViewButtonColumn()
MetroGrid7.Columns.Add(btn)
btn.HeaderText = "Security"
btn.Text = "LOCKED"
btn.Name = "btnSearchSecurity"
btn.UseColumnTextForButtonValue = True