Hi,

i made a composite control whish generate image around data (a panel decorate automaticly with image)

but it s realy slow on ie7 when i resize the client or when i have for example an accordion into the panel (its slow when the panel need to resize himselft )

do i made something wrong ?? here is the render code

public class PanelItem : CompositeControl
    { }

public class ExtendablePanel : CompositeControl
    {
      

  private ITemplate _itemTemplate;
        private ITemplate _headerTemplate;
        private ITemplate _footerTemplate;

        [TemplateContainer(typeof(PanelItem))]
        [PersistenceMode(PersistenceMode.InnerProperty)]
        public ITemplate FooterTemplate
        {
            get { return _footerTemplate; }
            set { _footerTemplate = value; }
        }


        [TemplateContainer(typeof(PanelItem))]
        [PersistenceMode(PersistenceMode.InnerProperty)]
        public ITemplate HeaderTemplate
        {
            get { return _headerTemplate; }
            set { _headerTemplate = value; }
        }


        [TemplateContainer(typeof(PanelItem))]
        [PersistenceMode(PersistenceMode.InnerProperty)]
        public ITemplate ItemTemplate
        {
            get { return _itemTemplate; }
            set { _itemTemplate = value; }
        }

protected override void CreateChildControls()
        {
           
                Controls.Clear();
                // -- had header --
                StringBuilder start = new StringBuilder("<table cellspacing=\"0\" cellpadding=\"0\" style=\"width:"+Width+"\">");
                start.Append("<tr style=\"height:" + CornerHeight + "\"><td align=\"right\" valign=\"top\"style=\"width:" + CornerWidth + ";height:" + CornerHeight + ";background-image:url('" + TopLeftImage + "');background-repeat:no-repeat;\"></td>");
                // -- insert left top image --
                start.Append("<td style=\"background-image:url('" + TopImage + "');background-repeat:repeat-x;\">");
                Controls.Add(new LiteralControl(start.ToString()));
                if (_headerTemplate != null)
                {
                    PanelItem p = new PanelItem();
                    //p.ID="panelitem";
                    _headerTemplate.InstantiateIn(p);
                    Controls.Add(p);
                }
                start = new StringBuilder("</td>");
                start.Append("<td align=\"left\" valign=\"top\"style=\"width:" + CornerWidth + ";height:" + CornerHeight + ";background-image:url('" + TopRightImage + "');background-repeat:no-repeat;\"></td></tr>");
                // -- had content
                start.Append("<tr><td align=\"right\" style=\"width:" + CornerWidth + ";background-image:url('" + LeftImage + "');background-repeat:repeat-y;\"></td>");
                if (MiddleImage != null)
                    start.Append("<td align=\"left\" valign=\"top\" style=\"background-image:url('" + MiddleImage + "');background-repeat:repeat;\">");
                else
                    start.Append("<td align=\"left\" valign=\"top\" style=\"background-color:" + ContentBackColor + "\">");
                Controls.Add(new LiteralControl(start.ToString()));
                if (_itemTemplate != null)
                {
                    PanelItem p = new PanelItem();
                    //p.ID="panelitem";
                    _itemTemplate.InstantiateIn(p);
                    Controls.Add(p);
                }
                start = new StringBuilder("</td>");
                start.Append("<td align=\"left\" style=\"width:" + CornerWidth + ";background-image:url('" + RightImage + "');background-repeat:repeat-y;\"></td></tr>");
                // -- had footer
                start.Append("<tr style=\"height:" + CornerHeight + "\"><td align=\"right\" valign=\"top\"style=\"width:" + CornerWidth + ";height:" + CornerHeight + ";background-image:url('" + DownLeftImage + "');background-repeat:no-repeat;\">");
                // -- insert left down image --
                start.Append("</td><td style=\"background-image:url('" + DownImage + "');background-repeat:repeat-x;\">");
                Controls.Add(new LiteralControl(start.ToString()));
                if (_footerTemplate != null)
                {
                    PanelItem p = new PanelItem();
                    //p.ID = "panelitem";
                    _footerTemplate.InstantiateIn(p);
                    Controls.Add(p);
                }
                start = new StringBuilder("</td><td align=\"left\" valign=\"top\"style=\"width:" + CornerWidth + ";height:" + CornerHeight + ";background-image:url('" + DownRightImage + "');background-repeat:no-repeat;\"></td></tr></table>");
                Controls.Add(new LiteralControl(start.ToString()));
            
        }

thx