WPF MaterialDesign Datagrid TextColumn没有看到所有文本

Question

我正在使用Material Design Framework。我想当鼠标悬停在datagrid textcolumn上时，文本将全部显示。我该怎么办？

<DataGridTextColumn Binding="{Binding Path=ted_not}" Header="Notlar" MinWidth="45" IsReadOnly="True">
       <DataGridTextColumn.ElementStyle>
             <Style TargetType="TextBlock">
               <Setter Property="VerticalAlignment" Value="Center"/>
               <Setter Property="Padding" Value="5,0,0,0"/>
             </Style>
       </DataGridTextColumn.ElementStyle>
  </DataGridTextColumn>

simple