Xamarin ios hide\remove UIPickerView

Question

I've create a custom UIPickerView with "Done" button but I have trouble to remove it from screen. This is the result of create the UIPickerView:

I've try to use this function:

public void removeAll(UIPickerView picker){
  this.toolbar.RemoveFromSuperview ();
  picker.RemoveFromSuperview ();
}

But the result is:

Answer 1

Resolved with:

public void removeAll(UIPickerView picker){
  this.toolbar.RemoveFromSuperview ();
  picker.Layer.Opacity = 0f;
  picker.Layer.Bounds = new  RectangleF(0,0,0,0);
  picker.RemoveFromSuperview ();
}