Themes should not affect certain styling demos

[gedinakova]

Description

Certain styling demos, which are now marked with a note, stating they won't be affected when changing the theme, actually are affected and the result is not good.

Steps to reproduce

1. Navigate to Advanced Filtering Styling demo
2. Apply a different theme

Result

The theme is applied although the cells & header area remain untouched.

Note:

This is valid for all such styling samples.

Expected result

Changing the theme should not affect these samples as stated in the note below each such one.