This feature will give you an archive calendar widget for your TypoXP Blogger sidebar.

Step#1
Goto the Template>Page Elements page, find or create your Blog Archive widget, and click to edit it. You'll see a screen like this



The title can be anything you want. The style MUST be Flat List as show. Options should NOT have Show Oldest Posts firsts checked. Archive Frequency MUST be Monthly. The Date Format can be anything you want. The calendar will accept whatever you decide here. Save the widget.

Step#2
Go to Template>Edit HTML. Leave the Expand Widget Templates box UNCHECKED (default).

Scroll down and find your BlogArchive Widget code in your template. Will look something like this.

<b:widget id='BlogArchive1' locked='false' title='Archives' type='BlogArchive'/>

Copy the following code, then highlight the archive widget as shown and replace it with a paste.

<b:widget id='BlogArchive1' locked='false' title='Calendar' type='BlogArchive'>
<b:includable id='main'>
<b:if cond='data:title'>
<div id='icon-cal'><h2><data:title/></h2></div>
</b:if>
<div class='widget-content'>
<div id='ArchiveList'>
<div expr:id='data:widget.instanceId + "_ArchiveList"'>
<b:if cond='data:style == "HIERARCHY"'>
<b:include data='data' name='interval'/>
</b:if>
<b:if cond='data:style == "FLAT"'>
<b:include data='data' name='flat'/>
</b:if>
<b:if cond='data:style == "MENU"'>
<b:include data='data' name='menu'/>
</b:if>
</div>
</div>
<b:include name='quickedit'/>
</div>
</b:includable>
<b:includable id='toggle' var='interval'>
<!-- Toggle not needed for Calendar -->
</b:includable>
<b:includable id='flat' var='data'>
<div id='bloggerCalendarList'>
<ul>
<b:loop values='data:data' var='i'>
<li class='archivedate'>
<a expr:href='data:i.url'><data:i.name/></a> (<data:i.post-count/>)
</li>
</b:loop>
</ul>
</div>

<div id='blogger_calendar' style='display:none'>
<table id='bcalendar'><caption id='bcaption'>

</caption>
<!-- Table Header -->
<thead id='bcHead'></thead>
<!-- Table Footer -->

<!-- Table Body -->
<tbody><tr><td id='cell1'> </td><td id='cell2'> </td><td id='cell3'> </td><td id='cell4'> </td><td id='cell5'> </td><td id='cell6'> </td><td id='cell7'> </td></tr>
<tr><td id='cell8'> </td><td id='cell9'> </td><td id='cell10'> </td><td id='cell11'> </td><td id='cell12'> </td><td id='cell13'> </td><td id='cell14'> </td></tr>
<tr><td id='cell15'> </td><td id='cell16'> </td><td id='cell17'> </td><td id='cell18'> </td><td id='cell19'> </td><td id='cell20'> </td><td id='cell21'> </td></tr>
<tr><td id='cell22'> </td><td id='cell23'> </td><td id='cell24'> </td><td id='cell25'> </td><td id='cell26'> </td><td id='cell27'> </td><td id='cell28'> </td></tr>
<tr><td id='cell29'> </td><td id='cell30'> </td><td id='cell31'> </td><td id='cell32'> </td><td id='cell33'> </td><td id='cell34'> </td><td id='cell35'> </td></tr>
<tr id='lastRow'><td id='cell36'> </td><td id='cell37'> </td></tr>
</tbody>
</table>
<table id='bcNavigation'><tr>
<td id='bcFootPrev'></td>
<td id='bcFootAll'></td>
<td id='bcFootNext'></td>
</tr></table>

<div id='calLoadingStatus' style='display:none; text-align:center;'>
<script type='text/javascript'>bcLoadStatus();</script>
</div>
<div id='calendarDisplay'/>

</div>

<script type='text/javascript'> initCal();</script>

</b:includable>
<b:includable id='posts' var='posts'>
<!-- posts not needed for Calendar -->
</b:includable>
<b:includable id='menu' var='data'>
Configure your calendar archive widget - Edit archive widget - Flat List - Newest first - Choose any Month/Year Format
</b:includable>
<b:includable id='interval' var='intervalData'>
Configure your calendar archive widget - Edit archive widget - Flat List - Newest first - Choose any Month/Year Format
</b:includable>
</b:widget>

Save the widget. Then try it out.

Thanks to phydeaux3. For more explanation, please read information here.