diff --git a/core/ui/ControlPanel/Modals/AddPlugins.tid b/core/ui/ControlPanel/Modals/AddPlugins.tid
index d25dc93ef..70235d498 100644
--- a/core/ui/ControlPanel/Modals/AddPlugins.tid
+++ b/core/ui/ControlPanel/Modals/AddPlugins.tid
@@ -78,13 +78,15 @@ $:/state/add-plugin-info/$(connectionTiddler)$/$(assetInfo)$
 <div class="tc-plugin-info-dropdown-body">
 <$transclude tiddler=<<assetInfo>> field="readme" mode="block"/>
 </div>
-<div class="tc-plugin-info-sub-plugins">
 <$set name="original-title" value={{{ [<assetInfo>get[original-title]] }}}>
+<$list filter="[all[tiddlers+shadows]tag[$:/tags/RemoteAssetInfo]server-url{!!url}original-plugin-type[$type$]has[parent-plugin]parent-plugin<original-title>limit[1]]" variable="ignore">
+<div class="tc-plugin-info-sub-plugins">
 <$list filter="[all[tiddlers+shadows]tag[$:/tags/RemoteAssetInfo]server-url{!!url}original-plugin-type[$type$]has[parent-plugin]parent-plugin<original-title>sort[title]sort[name]]" variable="assetInfo">
 <<display-plugin-info "$type$">>
 </$list>
-</$set>
 </div>
+</$list>
+</$set>
 </div>
 </$reveal>
 </$set>
diff --git a/editions/tw5.com/tiddlers/Plugin Types.tid b/editions/tw5.com/tiddlers/Plugin Types.tid
index c496fdbd0..8afb91a66 100644
--- a/editions/tw5.com/tiddlers/Plugin Types.tid	
+++ b/editions/tw5.com/tiddlers/Plugin Types.tid	
@@ -1,5 +1,5 @@
 created: 20190928081810311
-modified: 20190928081811355
+modified: 20190928103750812
 tags: 
 title: Plugin Types
 type: text/vnd.tiddlywiki
@@ -15,4 +15,6 @@ The following plugin types are used internally by the core:
 * `import` - for the special $:/Import plugin created while importing is in progress
 * `info` - for the special $:/temp/info-plugin tiddler created by the InfoMechanism
 
-While not supported by the plugin library, it is also possible to use custom plugin types to build plugin-like behaviour with a custom user interface. Plugins with a custom type will automatically receive the same behaviour as plain plugins but can display a custom user interface using an appropriate [[view template segment|SystemTag: $:/tags/ViewTemplate]].
\ No newline at end of file
+While not supported by the plugin library, it is also possible to use custom plugin types to build plugin-like behaviour with a custom user interface. Plugins with a custom type will automatically receive the same behaviour as plain plugins but can display a custom user interface using an appropriate [[view template segment|SystemTag: $:/tags/ViewTemplate]].
+
+By default, tiddlers within plugins with custom plugin types will not be registered as shadow tiddlers (the constituent tiddlers can still be addressed as subtiddlers by the TranscludeWidget, ViewWidget or the [[plugintiddlers Operator]]). Setting a configuration tiddler `$:/config/RegisterPluginType/<plugin-type>` to `yes` will cause the tiddlers within the plugin to be registered as shadow tiddlers.
diff --git a/themes/tiddlywiki/vanilla/base.tid b/themes/tiddlywiki/vanilla/base.tid
index 11d5b3cfc..1213fe7ab 100644
--- a/themes/tiddlywiki/vanilla/base.tid
+++ b/themes/tiddlywiki/vanilla/base.tid
@@ -2168,6 +2168,7 @@ a.tc-tiddlylink.tc-plugin-info:hover .tc-plugin-info > .tc-plugin-info-chunk > s
 
 .tc-plugin-info-dropdown {
 	border: 1px solid <<colour muted-foreground>>;
+	background: <<colour background>>;
 	margin-top: -8px;
 }
 
@@ -2180,6 +2181,7 @@ a.tc-tiddlylink.tc-plugin-info:hover .tc-plugin-info > .tc-plugin-info-chunk > s
 
 .tc-plugin-info-dropdown-body {
 	padding: 1em 1em 0 1em;
+	background: <<colour background>>;
 }
 
 .tc-plugin-info-sub-plugins {