我已尝试覆盖AppBarItem和键盘的默认主题，但应用栏项目的重点颜色仍为默认值，我已使用的资源如下所示。是否可以在代码中更改AppBarItem的背景和按下声明的手机键盘的背景？
"PhoneAccentBrush",
"ButtonPressedBackgroundThemeBrush",
"ProgressBarIndeterminateForegroundThemeBrush",
"ProgressBarForegroundThemeBrush",
"ToggleSwitchCurtainBackgroundThemeBrush",
"SliderTrackDecreaseBackgroundThemeBrush",
"CheckBoxPressedBackgroundThemeBrush",
"AppBarBackgroundThemeBrush",
"AppBarBorderThemeBrush",
"AppBarItemBackgroundThemeBrush",
"AppBarItemPointerOverBackgroundThemeBrush"
"AppBarItemPressedBackgroundThemeBrush"