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weird placeholder + session behaviour ! please hel

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I'm Having a weird thing with this placeholder, i'm trying to add controls that are stored in a session object: Session["controls"]

THE PROBLEM: in the following piece of code, only the literal controls are shown on the page but the button (web control) doesn´t show! it only shows if i put it before the literal controls but then the literal disapear!!! weird!!! please help!!!

// Create an HtmlButton control.
HtmlButton button = new HtmlButton();
button.InnerHtml = "Click Me! I'm a button!";

PlaceHolder ph1 = new PlaceHolder();

ph1.Controls.Add(new LiteralControl(@"<div id=""Layer1"" style=""position:absolute; width:200px; height:115px; z-index:1; left: 385px; top: 268px"">")); // LITERAL CONTROL
ph1.Controls.Add(button); // WEB CONTROL
ph1.Controls.Add(new LiteralControl("<br>my div - literal</div>")); // LITERAL CONTROL

Session["controls"] = ph1;//ADDS ALL CONTROLS TO SESSION VAR

PlaceHolder ph2 = ((PlaceHolder)(Session["controls"]));
for (int i = 0; i <= ph2.Controls.Count - 1; i++)
catch(Exception ex){}

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