XAML ContextMenu gets bound to wrong row in a DataGrid
- by Simon_Weaver
I have a XAML based ContextMenu bound to the rows in a datagrid. It works just fine - until the grid is scrolled!
This is the context menu for one of the controls in the visual tree or a DataGrid row.
<data:DataGridTemplateColumn Header="Customer Details" Width="*">
<data:DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<Grid Background="Transparent"> <!-- allows click in entire cell -->
<controlsInputToolkit:ContextMenuService.ContextMenu>
<controlsInputToolkit:ContextMenu>
<controlsInputToolkit:MenuItem Header="{Binding CompletedOrderId,StringFormat='Create Reminder for order #\{0\}'}"
CommandParameter="{Binding}">
<controlsInputToolkit:MenuItem.Command>
<command:CreateReminderCommand/>
</controlsInputToolkit:MenuItem.Command>
<controlsInputToolkit:MenuItem.Icon>
<Viewbox>
<Image Width="19" Height="18" Source="../images/reminders.png" VerticalAlignment="Center"/>
</Viewbox>
</controlsInputToolkit:MenuItem.Icon>
</controlsInputToolkit:MenuItem>
<controlsInputToolkit:ContextMenu>
<controlsInputToolkit:ContextMenuService.ContextMenu>
......
The ICommand is CreateReminderCommand and the CommandParameter is bound to the data item for the row itself.
This works just fine - I can right click on a row and it will show me the correct text in the menu item 'Create Reminder for order 12345'.
Then I scroll the datagrid down a page. If I keep right clicking on items then suddenly I'll see the wrong order number for a row. I think what must be happening is this :
The DataGrid is reusing instances of MenuItem that it has previously created.
How can I force a refresh of the ContextMenu when it is displayed for an item that changes? There's no 'Update method on the ContextMenu or ContextMenuService.
