White background under the keyboard - react-native

How to remove the white background that is under the keyboard?
In the screenshot below, I was able to capture the moment when a white background is visible.
Shown when the keyboard begins to appear.
In the end you can't see it but it is visible during the loading of the keyboard and it looks bad

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So i read the docs and it says to change customStyles in Menu Trigger but I tried many different things and it doesn't work.
I just want that when I press the menu I have no background color.

I'm having trouble removing the white border on v-expansion-panels when the header is clicked to open. The border is only in the animation

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keyboard bug when use UIKeyboardAppearanceDark - Objective C

when I call this code the keyboard become with gray color.
but sometimes the keyboard show like this image , and return to the gray after i switch keyboard.
update :
I think its happened after I open alert view and the keyboard was open.
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UISegmentedControl IOS7 hide border

I am having some graphical issues adapting my app to ios7. All my icons (color icons) now seem worse. They are completelly blue or grey depending where they are set.
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Is it possible?

Change background of Metro TextBox at normal state

I have a C#/XAML Metro-style application with a TextBox. By default, the TextBox displays with a gray background. When I hover over it with my mouse, the background lightens. When I put my focus into the TextBox, it has a white background.
I want to create a XAML style that will cause the TextBox to always have a white background, regardless of the position of my mouse or where my focus is in the application - how can I do this?
Thanks!
Andrew
You need to edit the control template.