Why this thing happens?

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ScriptManager

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In VS 2010 Ultimate,
I have a command button on my web page,
My aim is to display Modalpopup when this buttin is clicked.
I have taken Script Manager. and Panel as PopupControlID.

when program executes, if i click the button, Modal popup is not at all appearing.

When i changed Script Manager to ToolScriptManager, It works fine.

why so?

Experts say that better to use Script Manager of VS2010 than ToolScript Manager of Ajax Control Toolkit.


Kindly help me..