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Since this took me a while to find if you want a ComboBox to drop down straight away hook up its loaded event and:

private void ComboBox_Loaded(object sender, RoutedEventArgs e)
{
((ComboBox)sender).IsDropDownOpen = true;
}

I placed the style shown above in a new Style that I've defined in a resource dictionary but when I try to build I get the following error.

The event 'PreviewMouseLeftButtonDown' cannot be specified on a Target tag in a Style. Use an EventSetter instead.

Is this possible? I'm attempting to wrap the DataGrid up with a control that inherits from the WpfToolkit DataGrid so that I can add the functionality described here to a single control that I can reuse throughout different portions of my app.

The above code works great for me. I do have a question though. After the first click into a cell, is there a way to programmatically force input into the provided editor? For instance, if I have a combobox, I'd like for the combobox to be expanded when the user performs the first click. This would eliminate yet another click, which is important to my endusers.

I got rid of above error by including style tag inside datagrid resources. Now I wanted to know how to save the edited value to database?

I am getting this error when using singleclick code given above:
"itemcollection must be empty before using Itemsource". Can someone help here. Thanks.

Hi, using this method alone seems to leave all the rows/cells selected.
Adding "dataGrid.SelectedItems.Clear();" after "if (dataGrid != null)" fixed the problem.

I managed to find a way that suited my needs (reverse tabbing still doesn't work).

Here is one of my columns (I decided NO to textblocks - and have a single cell template):
<my:DataGridTemplateColumn Header="Item #">
<my:DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<TextBox Text="{Binding Path=ItemNumber}" />
</DataTemplate>
</my:DataGridTemplateColumn.CellTemplate>
</my:DataGridTemplateColumn>
I also have similar column for a CheckBox (I didn't like the built in column).

The changes a similar to the SingleClick:

<Style TargetType="{x:Type my:DataGridCell}">
<EventSetter Event="GotFocus" Handler="DataGridCell_GotFocus"></EventSetter>
</Style>


Private Sub DataGridCell_GotFocus(ByVal sender As Object, ByVal e As System.Windows.RoutedEventArgs)
Dim cell As DataGridCell = CType(sender, DataGridCell)
Dim childTxt As TextBox = FindVisualChild(Of TextBox)(cell)
If childTxt IsNot Nothing Then
If Not childTxt.IsFocused Then
Keyboard.Focus(childTxt)
End If
Exit Sub
End If

Dim childChk As CheckBox = FindVisualChild(Of CheckBox)(cell)
If childChk IsNot Nothing Then
If Not childChk.IsFocused Then
Keyboard.Focus(childChk)
End If
Exit Sub
End If
End Sub

Private Shared Function FindVisualChild(Of T As UIElement)(ByVal element As UIElement) As T
Dim child As UIElement = element
While child IsNot Nothing
Dim correctlyTyped As T = TryCast(child, T)
If correctlyTyped IsNot Nothing Then Return correctlyTyped
If VisualTreeHelper.GetChildrenCount(child) < 1 Then Exit While
child = CType(VisualTreeHelper.GetChild(child, 0), UIElement)
End While
Return Nothing
End Function

You would have to modify the GotFocus event handler to suit your individual needs.

Is there an easy way to fix the tabbing through the grid? If I have template columns I seem to need to tab twice before getting the focus?

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