Now I using a splitButton with some textbox in PopupGallery items.
Is therer any way to keep the popup open, when user finish typing and press enter key in these textboxs?
<ribbon:SplitButton Click="..." >
<ribbon:PopupGallery UseSingleColumn="True" ItemsSource="{Binding Path=...}" >
<ribbon:PopupGallery.ItemTemplate>
<DataTemplate>
<ribbon:TextBox Text ="{Binding Key, Mode=TwoWay}" />
</DataTemplate>
</ribbon:PopupGallery.ItemTemplate>
</ribbon:PopupGallery>