void WinFrmLifecycleEvent_ViewTableControlEvent(UserControl control, System.Windows.Forms.Control parent)
{
Point p = new Point(20, 50);
for (int i = 0; i < MainContent.Controls.Count; i++)
{
p.X += 20; p.Y += 20;
} //偏移控件的出现位置
control.Location = p;
parent.Controls.Add(control);
MainContent.Activate();
control.BringToFront();
}