Trying to implement color picker in uwp - xaml

Question

I'm trying to implement color picker in uwp using below link
[1]: http://www.c-sharpcorner.com/article/coding4fun-colorpicker-control-in-uwp-with-xaml-and-c-sharp/
but while following process and implementing colorchange event it is giving error "unable to add event handler".Any idea would be appreciated
XAML
xmlns:my="using:Coding4Fun.Toolkit.Controls"
<my:ColorPicker x:Name="W_Paints"
Margin="216,203,-6,0" Height="40"
Width="40" VerticalAlignment="Top"
HorizontalAlignment="Left"/>

Answer 1

I tried to create a color picker with Coding4Fun package by following the above link and the color picker is successfully created with no error on my side.
I used version 2.1.8, and also test version 2.1.7 which also worked. My uwp app target version is build 14393, but I also test with target version 10240. So if you created a uwp app with "Coding4Fun Toolkit - Controls" 2.1.7 or 2.1.8 should be able work well. Here is the demo completing code.
XAML Code
<Page
x:Class="Coding4fun.MainPage"
...
xmlns:my="using:Coding4Fun.Toolkit.Controls" >
<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
<TextBlock x:Name="tblTitle" HorizontalAlignment="Left" Margin="419,42,0,0" TextWrapping="Wrap" Text="Code4Fun ColorPicker control Demo" VerticalAlignment="Top" Height="37" Width="427" FontSize="24" FontWeight="Bold" />
<Button x:Name="btnCPopen" Content="Open Color Picker" HorizontalAlignment="Left" Margin="110,113,0,0" VerticalAlignment="Top" RenderTransformOrigin="-5.01,1.529" ToolTipService.ToolTip="Open color Picker for changing Background" Click="btnCPopen_Click" />
<Border x:Name="BorCP" BorderBrush="Black" BorderThickness="1" HorizontalAlignment="Left" Height="378" Margin="838,113,0,0" VerticalAlignment="Top" Width="354" />
<my:ColorPicker x:Name="CPtest" HorizontalAlignment="Left" Height="358" Margin="284,113,0,0" VerticalAlignment="Top" Width="374" ColorChanged="CPtest_ColorChanged" Visibility="Collapsed" />
</Grid>
Code behind
private void btnCPopen_Click(object sender, RoutedEventArgs e)
{
CPtest.Visibility = Visibility;
}
private void CPtest_ColorChanged(object sender, Windows.UI.Color color)
{
BorCP.Background = new SolidColorBrush(color);
}
I also upload the demo here you can download for testing and compare what's wrong with your project.