Similar to <advancedButton> but designed to be used outside the form

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@7472 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/resources/lib/layout/expandButton.jelly

+<!--
+  Expandable section that shows "advanced..." button by default.
+  Upon clicking it, a section unfolds.
+
+  Attributes:
+  @title :   title of the button. required.
+-->
+<j:jelly xmlns:j="jelly:core" xmlns:st="jelly:stapler" xmlns:d="jelly:define" xmlns:l="/lib/layout" xmlns:t="/lib/hudson" xmlns:f="/lib/form">
+  <div class="advancedLink">
+    <input type="button" value="${attrs.title}" class="expandButton" />
+  </div>
+  <div style="display:none">
+    <!-- this is the hidden portion to be expanded -->
+    <d:invokeBody/>
+  </div>
+</j:jelly>
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