In jQuery Mobile, I have a collapsible set:
<div data-role="collapsible-set" class="ui-collapsible-set ui-group-theme-inherit ui-corner-all">
<div data-role="collapsible" data-theme="a" class="ui-collapsible ui-collapsible-inset ui-corner-all ui-collapsible-themed-content ui-collapsible-collapsed ui-first-child">
<h3 class="ui-collapsible-heading ui-collapsible-heading-collapsed"><a href="#" class="ui-collapsible-heading-toggle ui-btn ui-icon-plus ui-btn-icon-left ui-btn-a">Tab 1</a></h3>
<div class="ui-collapsible-content ui-body-inherit ui-collapsible-content-collapsed" aria-hidden="true">
<p>Content 1</p>
</div>
</div>
<div data-role="collapsible" data-theme="a" class="ui-collapsible ui-collapsible-inset ui-corner-all ui-collapsible-themed-content ui-collapsible-collapsed ui-first-child">
<h3 class="ui-collapsible-heading ui-collapsible-heading-collapsed"><a href="#" class="ui-collapsible-heading-toggle ui-btn ui-icon-plus ui-btn-icon-left ui-btn-a">Tab 2</a></h3>
<div class="ui-collapsible-content ui-body-inherit ui-collapsible-content-collapsed" aria-hidden="true">
<p>Content 2</p>
</div>
</div>
<div data-role="collapsible" data-theme="a" class="ui-collapsible ui-collapsible-inset ui-corner-all ui-collapsible-themed-content ui-collapsible-collapsed ui-first-child">
<h3 class="ui-collapsible-heading ui-collapsible-heading-collapsed"><a href="#" class="ui-collapsible-heading-toggle ui-btn ui-icon-plus ui-btn-icon-left ui-btn-a">Tab 3</a></h3>
<div class="ui-collapsible-content ui-body-inherit ui-collapsible-content-collapsed" aria-hidden="true">
<p>Content 3</p>
</div>
</div>
</div>
How can I open, for example, the second panel programmatically?