How to open a sector when selecting a element?

Hello everybody

How do i open a selector like general as i select the element.

I am new to javascript, but i tried something out like this.

editor.on('component:selected', function(component) {
  if(component.attributes.tagName == 'div') {
    const styleManager = editor.StyleManager;
    styleManager.getSector('General',{
 
      open: true,
   
    });
  }
});

what iam doing wrong?

Thx for help