Syntax error ColorPickerDialog.xaml

[mHCAndi]

`

    <customControls:ColorPicker
        x:Name="cPicker"
        Margin="10,10,10,0"
        SelectedColorChanged="onSelectedColorChanged" />
</DockPanel>`

The second last line should reference OnSelectedColorChanged with capital letter.
SelectedColorChanged="OnSelectedColorChanged" />