Get the component (of which I don't know the instance class) from the one passed to <ng-content>

I have this component:

@Component({
selector: 'my-container',
template: `
    <div class="my-container">
        <div #wrapper class="my-container-body">
            <ng-content></ng-content>
        </div>
        <div class="my-container-footer"></div>
    </div>  
`
})
export class MyContainer implements AfterViewInit {
    @ViewChild('wrapped') item: ElementRef;

    ngAfterViewInit() {
        console.log('wrapped item is: ' + this.item.nativeElement);
    }
}

For example they can use my wrapped in the following way:

<my-container>
    <some-component></some-component>
<my-container>

As you can see I can access to wrapped component, using @ViewChild.
Instead I would like to access to the component instance that is passed to <ng-content></ng-content>, but maybe it couldn't work because I don't know what is the right type to use since I don't know what kind of component is passed to my wrapper.
The same occurs with @ContentChild.

Am I doing something wrong? How to access to properties and methods of the passed component that could be any component?

As you need something exact from the content component (in your case it is a NgControl) it would be more logical to query for control, not the whole component.

@ContentChild(NgControl) wrappedControl: NgControl;