I made an extremely basic DataGrid to test it out, but I immediately ran into this issue, where clicking a checkbox doesnt do anything for the first 2 clicks. It looks like it takes a click to click off whatever it was on, 1 more click to focus before it can actually check it with the third click.
This is the DataGrid I'm using btw (https://xceed.com/xceed-datagrid-for-wpf/).
XAML:
<UserControl.Resources>
<DataTemplate x:Key="ItemTemplate">
<StackPanel>
<TextBlock Text="{Binding Property1}"/>
<CheckBox IsChecked="{Binding Property2}"/>
</StackPanel>
</DataTemplate>
</UserControl.Resources>
<Grid>
<xcdg:DataGridControl ItemTemplate="{DynamicResource ItemTemplate}"
ItemsSource="{Binding Collection, Source={StaticResource SampleDataSource1}}"
UpdateSourceTrigger="CellContentChanged"
Margin="10">
</xcdg:DataGridControl>
</Grid>
The "SampleDataSource1" is just autogenerated but here it is anyway:
<SampleDataSource1:SampleDataSource1 xmlns:SampleDataSource1="clr-namespace:Expression.Blend.SampleData.SampleDataSource1">
<SampleDataSource1:SampleDataSource1.Collection>
<SampleDataSource1:Item Property1="Cras aenean" Property2="True"/>
<SampleDataSource1:Item Property1="Class mauris aliquam" Property2="False"/>
<SampleDataSource1:Item Property1="Maecenas integer duis curae" Property2="True"/>
<SampleDataSource1:Item Property1="Praesent nullam nunc" Property2="False"/>
<SampleDataSource1:Item Property1="Nam quisque" Property2="True"/>
<SampleDataSource1:Item Property1="Sed accumsan" Property2="False"/>
<SampleDataSource1:Item Property1="Aptent vivamus aliquam aliquet" Property2="True"/>
<SampleDataSource1:Item Property1="Blandit donec dis" Property2="False"/>
<SampleDataSource1:Item Property1="Amet commodo" Property2="True"/>
<SampleDataSource1:Item Property1="Ante conubia" Property2="False"/>
</SampleDataSource1:SampleDataSource1.Collection>
So, if you're lucky you'll see a big splash in your design window with a button that says: "Show configuration window" (which seems to disappear forever after using it). With that I generated some XAML to fix this issue:
<xcdg:DataGridControl ItemsSource="{Binding Source={StaticResource cvsSongs}}"
NavigationBehavior="RowOrCell"
CellEditorDisplayConditions="RowIsBeingEdited, MouseOverCell,
MouseOverRow, RowIsCurrent, CellIsCurrent"
EditTriggers="BeginEditCommand, ClickOnCurrentCell, SingleClick,
CellIsCurrent, ActivationGesture, RowIsCurrent"/>
If you know how to make that window appear once again feel free to comment.
Configuration Window info: Xceed documentation
Also some other people with Configuration Window problems. Might work for you: xceed forums