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protected override void CreateChildControls()
{
img = new Image();
lbl = new Label();
tbx = new TextBox();
img.ImageUrl = "Resouce/PicDate.Image.png";
img.Visible = false;
img.ID = "img";
this.Controls.Add(img);
this.Controls.Add(tbx);
this.Controls.Add(lbl);
tbx.Attributes.Add("onfocus", "document.getElementById('<%=img.ClientID%>').style.display='' ");
}