You can override the themes to the control's style by adding the corresponding ResourceDictionary in the sample and defining the new style with the BasedOn property. When the ResourceDictionary is added, you can acquire all the settings of the base style, and you can override them as desired. Using this approach, you can override the style for all the controls. Here, an example is illustrated to set the HeaderBackground for the TileViewItem by customizing the TileViewItemStyle using the BasedOn property.
Syntax for ResourceDictionary
Step 1: Add the Resource dictionary in App.xaml.
Syntax for BasedOn
Step 2: Define the new style using BasedOn Property
The following screenshot displays the customization of the theme.
Figure 1: Customized Theme
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