UpdateSourceTrigger no effect on GridViewCheckBoxColumn???

[swarmttied]

Even with the markup below, my object source is updated only after losing the focus. It should be during the checking and unchecking. Is there something wrong here?

<telerik:GridViewCheckBoxColumn Header="Accepted" MinWidth="75" MaxWidth="75" 
                          DataMemberBinding="{Binding IsAccepted, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
                          AutoSelectOnEdit="True" EditTriggers="CellClick"/>

[Dimitrina]

Hello,

 Indeed, this is the expected behaviour. Please use a CellTemplate inside the column instead:

<telerik:GridViewColumn>
         <telerik:GridViewColumn.CellTemplate>
               <DataTemplate>
                     <CheckBox IsChecked="{Binding IsChecked, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"/>
                </DataTemplate>
         </telerik:GridViewColumn.CellTemplate>
</telerik:GridViewColumn>

Is this what do you need?

Regards,
Didie
the Telerik team

[Martin]

This behavior is a bit weird since it means that UpdateSourceTrigger is completely useless. Is there any reason why the UpdateSourceTrigger is not used at all?

[Dilyan Traykov]

Hello Martin,

The reason why the UpdateSourceTrigger property is not respected in this case is due to the control's validation mechanism. By design, the binding is only updated when changes to the current cell are committed - once the cell loses focus or the Enter key is pressed.

As explained by my colleague, the way to bypass this is to use a custom cell template with a two-way binding to the underlying property.

I hope you find this clarification helpful. Should any other questions or concerns arise, do not hesitate to ask.

Regards,
Dilyan Traykov
Progress Telerik