C# WIN程序的有关问题，本人新手请大家多多指教

C# WIN程序的问题，本人新手请大家多多指教
C#   WIN程序。我点击textBox把隐藏的panel容器（容器里有复选框）显示出来,现在我要做点击panel容器以外的地方，都要隐藏panel容器。我该怎么做。

[解决办法]
panel1的LostFocus事件里面写

panel1.Hide();
[解决办法]
private void textBox1_Enter(object sender, EventArgs e)
{
panel1.Visible = true;
}

private void textBox1_Leave(object sender, EventArgs e)
{
panel1.Visible = false;
}
[解决办法]
确实考虑不周
public Form1()
{
InitializeComponent();
foreach (Control control in this.Controls)
{
if (control != textBox1 && control != panel1)
{
control.Enter += GroupInvisible;
}
}
}
private void GroupVisible(object sender, EventArgs e)
{
panel1.Visible = true;
}

private void GroupInvisible(object sender, EventArgs e)
{
panel1.Visible = false;
}
[解决办法]
楼上正解！·