Tooltip for each item in combobox

Question

I'm trying to add a tooltip for each username(CreatedBy) in my combobox in case the user name is too long for the width of the combobox.

I know this question has been asked a million times, I've tried using Style.Triggers method and I have also tried ToolTip="{Binding Path=SelectedCreatedBy.ToolTip, RelativeSource={RelativeSource Self}}

<ComboBox ItemsSource="{Binding CreatedBys.DefaultView}" SelectedValue="{Binding SelectedCreatedBy,UpdateSourceTrigger=PropertyChanged}" SelectedValuePath="CreatedBy" DisplayMemberPath="CreatedBy" ToolTip="{Binding SelectedCreatedBy}" 
    Grid.Row="3" Grid.Column="12" Height="22" Width="85" FontSize="11" IsEditable="{Binding IsCreatedByEditable}" VerticalAlignment="Top" HorizontalAlignment="Left" >

Edit: I found the solution and I will post the code here

<ComboBox ItemsSource="{Binding CreatedBys.DefaultView}" SelectedValue="{Binding SelectedCreatedBy,UpdateSourceTrigger=PropertyChanged}" SelectedValuePath="CreatedBy" DisplayMemberPath="CreatedBy" ToolTip="{Binding SelectedCreatedBy}" 
          Grid.Row="3" Grid.Column="12" Height="22" Width="85" FontSize="11" IsEditable="{Binding IsCreatedByEditable}" VerticalAlignment="Top" HorizontalAlignment="Left" >
<ComboBox.ItemContainerStyle>
    <Style>
        <Setter Property="Control.ToolTip" Value="{Binding CreatedBy}" />
    </Style>
      </ComboBox.ItemContainerStyle>
 </ComboBox>

Answer 1

If I understand correctly, you want a tool tip to appear for each of your combo box choices (not just the selected one). If that's the case, add the following code inside your ComboBox :

<ComboBox.ItemTemplate>
    <DataTemplate>
        <TextBlock
            Text="{Binding CreatedBy}"
            ToolTip="{Binding ToolTip}"
            />
    </DataTemplate>
</ComboBox.ItemTemplate>

<ComboBox.ItemContainerStyle>
    <Style TargetType="ComboBoxItem">
        <Setter Property="HorizontalContentAlignment" Value="Stretch" />
    </Style>
</ComboBox.ItemContainerStyle>

The ItemTemplate defines a TextBlock for each item with a ToolTip bound to the ToolTip property of your view model. The ItemContainerStyle stretches the ComboBoxItem so that the tool tip appears even if the mouse is not directly on the text but over the item.