Added some more hooks to the page editing pipeline. It should now be possible to add controls to the page editor, send the data from them out to the server, and process them on the server side.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>{#advanced_dlg.anchor_title}</title>
<script type="text/javascript" src="../../tiny_mce_popup.js"></script>
<script type="text/javascript" src="js/anchor.js"></script>
</head>
<body style="display: none">
<form onsubmit="AnchorDialog.update();return false;" action="#">
<table border="0" cellpadding="4" cellspacing="0">
<tr>
<td colspan="2" class="title">{#advanced_dlg.anchor_title}</td>
</tr>
<tr>
<td class="nowrap">{#advanced_dlg.anchor_name}:</td>
<td><input name="anchorName" type="text" class="mceFocus" id="anchorName" value="" style="width: 200px" /></td>
</tr>
</table>
<div class="mceActionPanel">
<div style="float: left">
<input type="submit" id="insert" name="insert" value="{#update}" />
</div>
<div style="float: right">
<input type="button" id="cancel" name="cancel" value="{#cancel}" onclick="tinyMCEPopup.close();" />
</div>
</div>
</form>
</body>
</html>