如何在扩展Telerik RadTileViewItem的自定义控件的标题中添加按钮

这是我的自定义控件，它扩展了Telerik RadTileViewItem控件：

 <telerik:RadTileViewItem x:Class="CrmActivityTimer.Customcontrols.TimerTile"
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
         xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
         xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"
         DataContext="{Binding RelativeSource={RelativeSource Self}}"
         mc:Ignorable="d" Height="525" Width="375" TileStateChanged="TimerTile_OnTileStateChanged">
<telerik:RadTileViewItem.Resources>
    <Style x:Key="TimerTileHeaderStyle">
    </Style>
</telerik:RadTileViewItem.Resources>
<Grid>
    <TextBox Text="{Binding Timer.TimeElapsed}" Width="100px" Height="20px" Margin="102,17,155,437" IsReadOnly="True"/>
    <Button Height="20px" Width="20px" Margin="216,17,121,437" Click="PlayButton_OnClick">
        <Image Source="icons/Play.png" />
    </Button>
    <Button Height="20px" Width="20px" Margin="242,17,95,437" Click="PauseButton_OnClick">
        <Image Source="icons/Pause.png"  />
    </Button>
    <telerik:RadComboBox Name="CboKlant" HorizontalAlignment="Left" Margin="101,79,0,0" VerticalAlignment="Top" Width="230"
                         ItemsSource="{Binding Fields.Accounts}" DisplayMemberPath="Name" SelectedValuePath="AccountId" KeyboardNavigation.TabIndex="1"/>
    <telerik:RadComboBox Name="CboBetreft" HorizontalAlignment="Left" Margin="101,160,0,0" VerticalAlignment="Top" Width="230" KeyboardNavigation.TabIndex="4"
                         DisplayMemberPath="{Binding Fields.BetreftNameField}" SelectedValuePath="{Binding Fields.BetreftIdField}"/>
    <TextBox Name="TxtOnderwerp" HorizontalAlignment="Left" Height="23" Margin="102,50,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="230" KeyboardNavigation.TabIndex="0"/>
    <Label Content="Onderwerp" HorizontalAlignment="Left" Margin="10,50,0,0" VerticalAlignment="Top" Height="23" Width="87" Padding="0"/>
    <Label Content="Klant" HorizontalAlignment="Left" Margin="9,78,0,0" VerticalAlignment="Top" Height="23" Width="87" Padding="0"/>
    <Label Content="Betreft" HorizontalAlignment="Left" Margin="9,159,0,0" VerticalAlignment="Top" Height="23" Width="87" Padding="0"/>
    <telerik:RadComboBox x:Name="CboUser" HorizontalAlignment="Left" Margin="101,188,0,0" VerticalAlignment="Top" Width="230" KeyboardNavigation.TabIndex="5"
                         ItemsSource="{Binding Fields.Users}" DisplayMemberPath="FullName" SelectedValuePath="SystemUserId" SelectedValue="{Binding Fields.Currentuser}" />
    <Label Content="Gebruiker" HorizontalAlignment="Left" Margin="9,187,0,0" VerticalAlignment="Top" Height="23" Width="87" Padding="0"/>
    <telerik:RadComboBox x:Name="CboService" HorizontalAlignment="Left" Margin="101,216,0,0" VerticalAlignment="Top" Width="230" KeyboardNavigation.TabIndex="6"
                         ItemsSource="{Binding Fields.Services}" DisplayMemberPath="Name" SelectedValuePath="ServiceId"/>
    <Label Content="Service" HorizontalAlignment="Left" Margin="9,215,0,0" VerticalAlignment="Top" Height="23" Width="87" Padding="0"/>
    <Button HorizontalAlignment="Left" Height="35" Margin="296,10,0,0" VerticalAlignment="Top" Width="35" Click="BtnCreateActivity_OnClick">
        <Image Source="icons/Save.png" Width="35"/>
    </Button>
    <telerik:RadComboBox HorizontalAlignment="Left" Margin="101,106,0,0" VerticalAlignment="Top" Width="230" SelectionChanged="CboKoppelingsType_OnSelectionChanged" KeyboardNavigation.TabIndex="2">
        <telerik:RadComboBoxItem Content="Verkoopkans"/>
        <telerik:RadComboBoxItem Content="Job"/>
        <telerik:RadComboBoxItem Content="Ticket"/>
    </telerik:RadComboBox>
    <Label Content="Betreft is een..." HorizontalAlignment="Left" Margin="9,106,0,0" VerticalAlignment="Top" Width="87" Height="22" Padding="0"/>
    <Label Content="Project" HorizontalAlignment="Left" Margin="9,133,0,0" VerticalAlignment="Top" Width="88" Padding="0"/>
    <telerik:RadComboBox Name="CboProject"  HorizontalAlignment="Left" Margin="102,133,0,0" VerticalAlignment="Top" Width="229" KeyboardNavigation.TabIndex="3"
                          ItemsSource="{Binding Fields.Projects}" DisplayMemberPath="New_titel" SelectedValuePath="New_ProjectId" SelectionChanged="CboProject_SelectionChanged" />
    <TextBox Name="TxtVoorKlant" HorizontalAlignment="Left" Height="166" Margin="9,282,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="147"/>
    <TextBox Name="TxtVoorIntern" HorizontalAlignment="Left" Height="166" Margin="176,282,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="155"/>
    <Label Content="Voor de klant" HorizontalAlignment="Left" Margin="9,251,0,0" VerticalAlignment="Top" Width="87" Padding="0"/>
    <Label Content="Intern" HorizontalAlignment="Left" Margin="170,251,0,0" VerticalAlignment="Top" Width="87" Padding="0"/>
</Grid>

我正试图在标题中向该控件添加一个按钮，以从TileView中删除该控件的实例。然而，关于这个问题的每一个教程都涉及到一个带有自定义标题的默认RadTileViewItem。我想修改RadTileViewItem的扩展上的标头。我试过在上使用示例代码http://www.telerik.com/forums/customize-radtileview，http://www.telerik.com/forums/header-template和其他控件，但我最终要么使用所有控件都已就位但没有自定义标头的TimerFile控件，要么使用自定义标头但没有其他控件的Timerile控件。

有人知道我该怎么做吗？我已经尝试过将所有控件移动到模板本身，但我不知道如何做到这一点，我确信这应该是可能的，不会有太多问题。