Apply a theme to a control!

Only button applies to theme I have 1 TabControlExt and I want to apply skinmanager + theme metro to it.

x:Class="MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:PQD"
mc:Ignorable="d"
Title="MainWindow" Height="350" Width="525"
xmlns:syncfusion="http://schemas.syncfusion.com/wpf"
xmlns:syncfusionskin ="clr-namespace:Syncfusion.SfSkinManager;assembly=Syncfusion.SfSkinManager.WPF"
syncfusionskin:SfSkinManager.Theme="{syncfusionskin:SkinManagerExtension ThemeName=Metro}">