Adjust to make the active class work.

Author: ulion

demos/index.html

@@ -37,7 +37,7 @@ <h1 flex>Angular Material Accordion</h1>
               <md-subheader class="md-no-sticky">Caption</md-subheader>
 
               <md-accordion-content md-icon="home" md-heading="Menu 1" md-arrow="true" md-accordion-collapsed="false">
-                <md-accordion-button href="#">Submenu 1</md-accordion-button>
+                <md-accordion-button href="#" md-active="true">Submenu 1</md-accordion-button>
                 <md-accordion-button href="#">Submenu 2</md-accordion-button>
                 <md-accordion-button href="#">Submenu 3</md-accordion-button>
               </md-accordion-content>