private void button_Click(object sender, EventArgs e) 
{ 
    // pass in the containing panel 
    LoadControl<MyControls.MyControl>(panelContainer); 
} 
 
void LoadControl<T>(Panel panel) where T : Control, new() 
{ 
    T _Control = GetControl<T>(panel); 
    if (_Control == null) 
    { 
        _Control = new T(); 
        _Control.Dock = DockStyle.Fill; 
        panel.Controls.Add(_Control); 
    } 
    _Control.BringToFront(); 
} 
 
T GetControl<T>(Panel panel) where T : Control 
{ 
    Type _Type = typeof(T); 
    String _Name = _Type.ToString(); 
    if (!panel.Controls.ContainsKey(_Name)) 
        return null; 
    T _Control = panel.Controls[_Name] as T; 
    return _Control; 
}