public QQTextBoxEx()
{
this.SetStyle(
ControlStyles.UserPaint |
ControlStyles.AllPaintingInWmPaint |
ControlStyles.OptimizedDoubleBuffer |
ControlStyles.ResizeRedraw |
ControlStyles.DoubleBuffer, true);
InitializeComponent();
this.InitEvents();
this.BackColor = Color.Transparent;
this.UpdateStyles();
}