Question

I’m using Tim Heuer’s style to get an editable combo box from here:
http://timheuer.com/blog/archive/2008/11/05/silverlight-editable-combobox-using-styles.aspx

This is working well in my project circa the previous release of the Silverlight Toolkit. Unfortunately, attempting to use this style with SL3 RTM and the latest SL Toolkit doesn’t work. I suspect that the problem has to do with this: “Breaking Change: The “DropDownToggle” template part of type ToggleButton has been removed.” I’m not sure how to fix it to get the drop down part to work again, any ideas?

Answer 1

For me it works now. I added this line to ToggleButton declaration in EditableComboStyle template:

IsChecked="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=IsDropDownOpen, Mode=TwoWay}"

Also it is important to change the ListBox name to x:Name=”Selector” in the same EditableComboStyle template like Jeff said. Then the control is used as:

<toolkit:AutoCompleteBox MinimumPrefixLength="0" 
                                 MinimumPopulateDelay="200" 
                                 x:Name="editableCombo"
                                 Style="{StaticResource EditableComboStyle}"
                                 Text="{Binding MyProperty, Mode=TwoWay, NotifyOnValidationError=True, ValidatesOnExceptions=True}" />

But unfortunately when the desired editable combobox behavior works, other issues appears:

1. I have problem with immediate binding when user click on toogle button which causes immediate validation before any item is selected or text written.

2. User have to press tab twice for move to other control.