dateTimepicker选择了日期后，日历没隐藏起来

[Johnny_Bao]

public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

private void dtpBirth_ValueChanged(object sender, EventArgs e)
{
dtpBirth.Format = DateTimePickerFormat.Short;
dtpBirth.CustomFormat = null;
}

private void Form1_Load(object sender, EventArgs e)
{
dtpBirth.Format = DateTimePickerFormat.Custom;
dtpBirth.CustomFormat = " ";
}


}