win universal app - How to change background overlay of ContentDialog uwp -


i developing uwp win10 app using vs2015. using contendialog show modal window / popup. need change background overlay color of contentdialog. how this. there no option/property in inner style too.

i need change overlay white dim color other color blackish overlay/dim color etc...

see pic.

enter image description here

i think need custom use control have more control on background. default contendialog provide bare bone setup , has limitations number of buttons / contents.


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