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.
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>{#template_dlg.title}</title>
<script type="text/javascript" src="../../tiny_mce_popup.js"></script>
<script type="text/javascript" src="js/template.js"></script>
<link href="css/template.css" rel="stylesheet" type="text/css" />
</head>
<body onresize="TemplateDialog.resize();">
<form onsubmit="TemplateDialog.insert();return false;">
<div id="frmbody">
<div class="title">{#template_dlg.desc}</div>
<div class="frmRow"><label for="tpath" title="{#template_dlg.select}">{#template_dlg.label}:</label>
<select id="tpath" name="tpath" onchange="TemplateDialog.selectTemplate(this.options[this.selectedIndex].value, this.options[this.selectedIndex].text);" class="mceFocus">
<option value="">{#template_dlg.select}...</option>
</select>
<span id="warning"></span></div>
<div class="frmRow"><label for="tdesc">{#template_dlg.desc_label}:</label>
<span id="tmpldesc"></span></div>
<fieldset>
<legend>{#template_dlg.preview}</legend>
<iframe id="templatesrc" name="templatesrc" src="blank.htm" width="690" height="400" frameborder="0"></iframe>
</fieldset>
</div>
<div class="mceActionPanel">
<div style="float: left">
<input type="submit" id="insert" name="insert" value="{#insert}" />
</div>
<div style="float: right">
<input type="button" id="cancel" name="cancel" value="{#cancel}" onclick="tinyMCEPopup.close();" />
</div>
<br style="clear:both" />
</div>
</form>
</body>
</html>