Custom Theme for UI for Xamarin

CustomTheme.xaml

<ResourceDictionary xmlns="http://xamarin.com/schemas/2014/forms"
                    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
                    x:Class="TelerikXamarinApp1.Portable.Themes.CustomTheme">

    <!-- Chart -->
    <Color x:Key="ChartAxisColor">#919191</Color>
    <Color x:Key="ChartGridLinesColor">#D9D9D9</Color>

    <!-- ListView -->
    <Color x:Key="ListViewItemBorderColor">Azure</Color>
    <Color x:Key="ListViewSelectionColor">Red</Color>
    <Color x:Key="ListViewBackgroundColor">Black</Color>
    <Color x:Key="ListViewForegroundColor">LightSkyBlue</Color>
    <Color x:Key="ListViewSelectionBackgroundColor">Black</Color>

    <!-- Grid -->
    <Color x:Key="DataGridAccentColor">#3148CA</Color>

    <!-- Calendar -->
    <Color x:Key="CalendarBasicFontColor">#4A4949</Color>
    <Color x:Key="CalendarAlternativeFontColor">#919191</Color>
    <Color x:Key="CalendarGridColor">#D9D9D9</Color>
    <Color x:Key="CalendarMenuBarColor">#F8F8F8</Color>
    <Color x:Key="CalendarAccentColor1">#3148CA</Color>
    <Color x:Key="CalendarAccentColor2">#30BCFF</Color>
    <Color x:Key="CalendarBackgroundColor1">#3D5AFE</Color>
    <Color x:Key="CalendarBackgroundColor2">#000000</Color>
    <Color x:Key="CalendarBackgroundColor3">#FFFFFF</Color>
    <Color x:Key="CalendarComplementaryColor1">#FF5225</Color>
    <Color x:Key="CalendarComplementaryColor2">#FFC325</Color>

    <!-- DataForm -->
    <Color x:Key="DataFormEditorAccentColor">#3148CA</Color>
    <Color x:Key="DataFormBackgroundColor">White</Color>
    <Color x:Key="DataFormHeaderFontColor">#919191</Color>
    <Color x:Key="DataFormEditorBorderColor">#D9D9D9</Color>

    <!-- MaskedInput -->
    <Color x:Key="MaskedInputBorderColor">#D9D9D9</Color>
    <Color x:Key="MaskedInputWatermarkColor">#919191</Color>
    <Color x:Key="MaskedInputErrorColor">#D50002</Color>
    <Color x:Key="MaskedInputDisplayedTextColor">#4A4949</Color>

    <!-- SegmentedControl -->
    <Color x:Key="SegmentControlAccentColor">#3148CA</Color>
    <Color x:Key="SegmentControlMainColor">#FFFFFF</Color>

    <!-- Rating -->
    <Color x:Key="RatingControlAccentColor">#3148CA</Color>

    <!-- AutoComplete -->
    <Color x:Key="AutoCompleteSelectedTokenBackgroundColor">#3148CA</Color>
    <Color x:Key="AutoCompleteSelectedTokenStrokeColor">#3148CA</Color>
    <Color x:Key="AutoCompleteSelectedTokenTextColor">#FFFFFF</Color>

    <Color x:Key="AutoCompleteSuggestionItemTextColor">#3148CA</Color>
    <Color x:Key="AutoCompleteBorderColor">#D9D9D9</Color>
    <Color x:Key="AutoCompleteSuggestionViewBackgroundColor">#F8F8F8</Color>

    <OnPlatform x:Key="AutoCompleteTokenBackgroundColor"
                x:TypeArguments="Color">
        <On Platform="Android"
            Value="#F8F8F8" />
        <On Platform="iOS"
            Value="#4A4949" />
    </OnPlatform>

    <OnPlatform x:Key="AutoCompleteTokenTextColor"
                x:TypeArguments="Color">
        <On Platform="Android"
            Value="#7C7C7C" />
        <On Platform="iOS"
            Value="#F8F8F8" />
    </OnPlatform>

    <OnPlatform x:Key="AutoCompleteTokenStrokeColor"
                x:TypeArguments="Color">
        <On Platform="Android"
            Value="#7C7C7C" />
        <On Platform="iOS"
            Value="Transparent" />
    </OnPlatform>

    <!-- TabView-->
    <Color x:Key="ToolbarItemSelected">#3148CA</Color>

    <!-- BusyIndicator -->
    <Color x:Key="BusyIndicatorContent">#3148CA</Color>

    <!-- SlideView -->
    <Color x:Key="SlideViewIndicator">#D9D9D9</Color>
    <Color x:Key="SlideViewSelectedIndicator">#3148CA</Color>
    <Color x:Key="SlideViewPreviousItemButton">#3148CA</Color>
</ResourceDictionary>

CustomTheme.xaml.cs

public partial class CustomTheme : ResourceDictionary
    {
        public CustomTheme ()
        {
            InitializeComponent ();
        }
    }