Unable to set DataGridColumn's ToolTip

Question

I tried the following:

<tk:DataGridTextColumn 
    Header="Item" 
    Binding="{Binding Item.Title}" 
    ToolTipService.ToolTip="{Binding Item.Description}" />

And I don't see any tool tip.

Any ideas? Is it even implemented?

Answer 1

pls, check if the code below would work for you, it should be displaying tooltips for columns headers and cells, cell's tooltip should be bent the Description field of the data object:

<DataGridTextColumn Width="SizeToCells"   
                    MinWidth="150" 
                    Binding="{Binding Name}">

    <DataGridTextColumn.Header>
        <TextBlock Text="Name" ToolTipService.ToolTip="Header ToolTip" />
    </DataGridTextColumn.Header>

    <DataGridTextColumn.ElementStyle>
        <Style TargetType="{x:Type TextBlock}">
            <Setter Property="ToolTip" Value="{Binding Description}" />
            <Setter Property="TextWrapping" Value="Wrap" />
        </Style>
    </DataGridTextColumn.ElementStyle>
</DataGridTextColumn>

solution found here: 5 Random Gotchas with the WPF DataGrid

Answer 2

The DataGridTextColumn is not visible. You have to set tooltips on the header or the content.

To set a ToolTip on the header, change the Header to a TextBlock:

<tk:DataGridTextColumn
  Binding="{Binding Item.Title}">
  <tk:DataGridTextColumn.Header>
    <TextBlock
      Text="Text" 
      ToolTipService.ToolTip="Tooltip for header" />
  </tk:DataGridTextColumn.Header>
</tk:DataGridTextColumn>

To set a ToolTip on the column contents, set it in the Style:

<tk:DataGridTextColumn
  Binding="{Binding Item.Title}"
  Heading="Text">
  <tk:DataGridTextColumn.ElementStyle>
    <Style>
      <Setter Property="ToolTipService.ToolTip" Value="{Binding Item.Description}" />
    </Style>
  </tk:DataGridTextColumn.ElementStyle>
</tk:DataGridTextColumn>

You may also want to set EditingElementStyle.

Answer 3

This works for me:

<Style TargetType="{x:Type Custom:DataGridColumnHeader}">
   <Style.Triggers>
      <Trigger Property="IsMouseOver" Value="True">
          <Setter Property="ToolTip" Value="{Binding Column.(ToolTipService.ToolTip), RelativeSource={RelativeSource Self}}"/>
      </Trigger>
   </Style.Triggers>
</Style>