Use `component:selected` in OpenStyleManager

src/commands/view/OpenStyleManager.js

@@ -45,7 +45,7 @@ module.exports = {
       this.panel.set('appendContent', this.$cn).trigger('change:appendContent');
 
       this.target = em.editor;
-      this.listenTo(this.target, 'change:selectedComponent', this.toggleSm);
+      this.listenTo(this.target, 'component:selected', this.toggleSm);
     }
     this.toggleSm();
   },
@@ -58,7 +58,7 @@ module.exports = {
     const sender = this.sender;
     if (sender && sender.get && !sender.get('active')) return;
 
-    if (this.target.get('selectedComponent')) {
+    if (this.target.getSelected()) {
       this.$cn2.show();
       this.$header.hide();
     } else {