To use the file dialogs you will need to add the following references:
Usually, you can find the required references for each control in its Getting Started
You can check the Setting a Theme
article to see how to apply a theme (like the Fluent theme for example).
The blur effect of the window is supported only by the Fluent theme
and it is enabled by default. However, keep in mind that this is supported only under Windows 10.
You can find more information about the control in its help documentation
I hope that helps.
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