DevExpress GridControlが空のツールチップを表示するのはなぜですか？

Question

私はDevExpress GridControlを作成します。 ここにGroupBoxとGridControlの完全なコードがあります。理由は分かりませんが、空のツールチップが表示されています。 私はコードで多くの変更を行い、DevExpressフォーラムを読むようにしていますが、うまくいきません。

<GroupBox Grid.Row="0"> 
         <GroupBox.Header> 
          <TextBlock FontWeight="Bold" 
          Text="GroupBox"/> 
         </GroupBox.Header> 

         <Grid 
         ScrollViewer.CanContentScroll="True" 
         ScrollViewer.HorizontalScrollBarVisibility="Auto" 
         ScrollViewer.VerticalScrollBarVisibility="Auto" 
         > 
          <Grid.RowDefinitions> 
           <RowDefinition Height="*" ></RowDefinition> 
          </Grid.RowDefinitions> 

          <dxg:GridControl Grid.Row="0"          
           x:Name="grUsagePoint" 
           VerticalAlignment="Stretch"          
           HorizontalAlignment="Stretch" 
           dx:ThemeManager.ThemeName="Seven" 

           ScrollViewer.CanContentScroll="True" 
           ScrollViewer.HorizontalScrollBarVisibility="Auto" 
           ScrollViewer.VerticalScrollBarVisibility="Auto"          
           ItemsSource="{Binding Collection,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}" 
           SelectedItem="{Binding CurrentElement,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}"             
           > 

           <dxg:GridControl.View> 
            <!--region #RowCellMenuCustomization--> 
            <dxg:TableView x:Name="view" AutoWidth="True"> 
             <dxg:TableView.RowCellMenuCustomizations> 
              <dxb:BarButtonItem Content="First"           
                ItemClick="CellDataItem_Link_ItemClick" 
                Glyph="First.png" 
                > 
              </dxb:BarButtonItem> 

              <dxb:BarButtonItem Content="Second"           
             ItemClick="CellDataItem_UnLink_ItemClick" 
                Glyph="Second.png" 
                > 
              </dxb:BarButtonItem> 

              <dxb:BarButtonItem Content="Third"           
             ItemClick="CellDataItem_Open_ItemClick" 
                Glyph="Third.png" 
                > 
              </dxb:BarButtonItem> 

              <dxb:BarItemSeparator /> 

              <dxb:BarButtonItem Content="Something"           
             ItemClick="CellDataItem_FindInTree_ItemClick" 
                Glyph="Something.png" 
                > 
              </dxb:BarButtonItem> 

             </dxg:TableView.RowCellMenuCustomizations> 
            </dxg:TableView> 
            <!--endregion #RowCellMenuCustomization--> 
           </dxg:GridControl.View> 

           <dxg:GridControl.Columns> 

            <dxg:GridColumn Header="First column" 
              AllowEditing="False" 
              Width="*"        
              HorizontalHeaderContentAlignment="Stretch" 
              AllowResizing="True" 
              Binding="{Binding First,Mode=OneWay,UpdateSourceTrigger=PropertyChanged}" 

             ></dxg:GridColumn> 
            <dxg:GridColumn Header="Second column" 
             AllowEditing="False"  
              MinWidth="80" 
              Width="Auto" 
              HorizontalHeaderContentAlignment="Stretch" 
              AllowResizing="True" 
              ToolTip="tooltip" 
              Binding="{Binding Second,Mode=OneWay,UpdateSourceTrigger=PropertyChanged}" HeaderToolTip="Second" 
             > 

            </dxg:GridColumn> 
            <dxg:GridColumn Header="Third column" 
              AllowEditing="False" 
              Visible="False" 
              Width="*" 
              HorizontalHeaderContentAlignment="Stretch"             
              AllowResizing="True" 
              ToolTip="tool tip" 
              Binding="{Binding Third,Mode=OneWay,UpdateSourceTrigger=PropertyChanged}" HeaderToolTip="Third" 
             > 
            </dxg:GridColumn> 
            <dxg:GridColumn Header="Fourth column            
              AllowEditing="False" 
              HorizontalHeaderContentAlignment="Center            
              FixedWidth="True"            
              AllowResizing="False" 
              Width="35"  
              ToolTip="tool tip" 
             Binding="{Binding Fourth,Mode=OneWay,UpdateSourceTrigger=PropertyChanged}" HeaderToolTip="Header tooltip" 
             > 

            </dxg:GridColumn> 

            <dxg:GridColumn Header="fifth column" 
             AllowEditing="False" 
             HorizontalHeaderContentAlignment="Center"            
             FixedWidth="True"            
             AllowResizing="False" 
             Width="35" 
             ToolTip="tool tip" 
             Binding="{Binding Fifth,Mode=OneWay,UpdateSourceTrigger=PropertyChanged}" HeaderToolTip="Header tooltip" 
             > 

            </dxg:GridColumn> 


            <dxg:GridColumn 
          Header="sixth column" 
          Binding="{Binding Sixth,Mode=OneWay,UpdateSourceTrigger=PropertyChanged}"  
          ToolTip="tool tip" 
          HorizontalHeaderContentAlignment="Stretch" 
          FixedWidth="False" 
          AllowEditing="False" AllowResizing="True" HeaderToolTip="Header tooltip" 
          ></dxg:GridColumn> 

            <dxg:GridColumn 
          Header="Seventh column" 
          Binding="{Binding Seventh,Mode=OneWay,UpdateSourceTrigger=PropertyChanged}" 
          AllowEditing="False"  
          ToolTip="tool tip" 
          HorizontalHeaderContentAlignment="Stretch" 
          Width="*"                       
          AllowResizing="True" 
          HeaderToolTip="Header tooltip" 

          /> 

           </dxg:GridControl.Columns> 

           <dxg:GridControl.ContextMenu> 
            <ContextMenu DataContext="{Binding PlacementTarget.DataContext, RelativeSource={RelativeSource Self}}"> 
             <MenuItem Header="First" 
             Command="{Binding FirstCommand}"> 
              <MenuItem.Icon> 
               <Image Source="First.png" /> 
              </MenuItem.Icon> 
             </MenuItem> 
             <MenuItem Header="Second" 
             Command="{Binding SecondCommand}"> 
              <MenuItem.Icon> 
               <Image Source="Second.png" /> 
              </MenuItem.Icon> 
             </MenuItem> 
             <Separator /> 
             <MenuItem Header="Third" 
             Command="{Binding ThirdCommand}"> 
              <MenuItem.Icon> 
               <Image Source="Third.png" /> 
              </MenuItem.Icon> 
             </MenuItem> 

             <MenuItem Header="Fourth" 
             Command="{Binding FourthCommand}"> 
              <MenuItem.Icon> 
               <Image Source="Fourth.png" /> 
              </MenuItem.Icon> 
             </MenuItem> 

            </ContextMenu> 
           </dxg:GridControl.ContextMenu> 
           <dxg:GridControl.InputBindings> 
            <MouseBinding MouseAction="LeftDoubleClick" 
             Command="{Binding OpenCommand}"/> 
           </dxg:GridControl.InputBindings> 
          </dxg:GridControl> 
         </Grid> 
        </GroupBox> 

ただし、ツールチップを表示しようとすると非常に奇妙です。空の文字列が表示されます。

ここでは画像：？ツールチップは、グリッド内のように、同じ値を示したようにする方法

Answer 1

は、列のCellStyleにTooltipプロパティを設定してください：

<dxg:GridColumn Header="Fourth column"            
       AllowEditing="False" 
       HorizontalHeaderContentAlignment="Center"           
       FixedWidth="True"            
       AllowResizing="False" 
       Width="35"  
       Binding="{Binding Fourth,Mode=OneWay,UpdateSourceTrigger=PropertyChanged}"> 
    <dxg:GridColumn.CellStyle> 
     <Style BasedOn="{StaticResource {dxgt:GridRowThemeKey ResourceKey=CellStyle}}" TargetType="dxg:GridCellContentPresenter"> 
      <Setter Property="ToolTip" Value="tool tip"/> 
     </Style> 
    </dxg:GridColumn.CellStyle> 
</dxg:GridColumn>