关于在模板中显示图片的有关问题

关于在模板中显示图片的问题？

下面是我自定义的一个模板，其中的图片一行]<Image Name="tImage" Margin="0,5,5,0" Width="150" Source="{Binding pic_byte, Converter={StaticResource ImageConverter}}" /> 不知道为什么就是显示不出来，是不是用法不对？当中有自定义一个转换类，imageconverter这个类没问题，因为我把同样的代码拷贝到  
============================================================================以下代码图片能显示出来
<slData:DataGridTemplateColumn Header="图片" Width="50">
  <slData:DataGridTemplateColumn.CellTemplate>
  <DataTemplate>
  <Image Name="tImage" Margin="0,5,5,0" Width="50" Tag="{Binding Path=picture }" MouseLeftButtonDown="Image_MouseLeftButtonDown" Source="{Binding pic_byte, Converter={StaticResource ImageConverter}}" />
  </DataTemplate>
  </slData:DataGridTemplateColumn.CellTemplate>
  </slData:DataGridTemplateColumn>



================================================
以下模板图片显示不出来，调用方法
Button bt = new Button();

  bt.DataContext = tmpGr.Attributes;
  //ControlTemplate tt = getControlTemplate(tmpGr);
  //bt.Template = tt;
  bt.Template = (ControlTemplate)this.FindName(TipTemplate);
   
  p.Child = (UIElement)bt;
  // bt.VerticalOffset=
  Point tmpt = MyMap.MapToScreen(mpt);
  // Set where the popup will show up on the screen.
  p.VerticalOffset = tmpt.Y;
  p.HorizontalOffset = tmpt.X;

  // Open the popup.
  //p.IsOpen = true ;
  string id = tmpGr.Attributes["PopUpFlag"].ToString();
  tmpGr.MapTip = bt;

=======以下模板图片显示不出来，其它绑定字段能显示出来，图片路径改一下又能显示Source="img/look.png" ，真是郁闷呀
<ControlTemplate x:Name="pipeline" >
  <Grid Background="White" Margin="5" Width="200" Height="300" ShowGridLines="False" HorizontalAlignment="Center" VerticalAlignment="Center" >
  <Grid.RowDefinitions >
  <RowDefinition Height="160" />
  <RowDefinition Height="30"/>
  <RowDefinition Height="30"/>
  <RowDefinition Height="30"/>
  <RowDefinition Height="30"/>
  <RowDefinition Height="30"/>
  </Grid.RowDefinitions>
  <Grid.ColumnDefinitions> 
  <ColumnDefinition Width="70" />
  <ColumnDefinition Width="130" />
  </Grid.ColumnDefinitions >  
  <Image Name="tImage" Margin="0,5,5,0" Width="150" Source="{Binding pic_byte, Converter={StaticResource ImageConverter}}" />
  <TextBlock HorizontalAlignment="Center" VerticalAlignment="Center" Grid.Row="1" Grid.Column="0" Text="事件类型" />
  <TextBlock HorizontalAlignment="Center" VerticalAlignment="Center" Grid.Row="1" Grid.Column="1" Text="{Binding Converter={StaticResource MyDictionaryConverter},ConverterParameter=time, Mode=OneWay}" />