...
<com:TPanel ID="blockMenu">
	<com:TContentPlaceHolder ID="cphPnlMenu" />
</com:TPanel>

<com:TPanel ID="blockContent">
	<com:TContentPlaceHolder ID="cphPnlMain" />
</com:TPanel>

<com:TPanel ID="blockLogin">
	<com:TContentPlaceHolder ID="cphPnlLogin" />
</com:TPanel>

...