contenttemplateselector

I set a ContentControl in the right of Window, and set Content binding Items (it's type is ObservableCollection). Now I want to achieve it: if there are no item, ContentControl select first DataTemplate, and add a item into items, ContentControl will select second DataTemplate to display some info. Like this: The problem is when I add one item into items, ContentControl didnot update and change DataTemplate, I have a try to set mode, UpdateSourceTrigger, etc., but failed. In ViewModel, after delete a item, I use this statements, it will work well <1> : private void ExecuteDeleteClientCommand()

I have made a sample demo VS 2010 RC sample project, because in my production project I have the same error using MVVM. In my sample demo project I use only Code-behind without 3rd party dependencies so you can download the demo project here and run it for yourself: http://www.sendspace.com/file/mwx7wv Now to the problem: When I click the girls/boys button it should switch the datatemplate, not? What do I wrong? OK I offer here a code snippet too: Code-Behind MainWindow.cs : namespace ContentTemplateSelectorDemo { /// <summary> /// Interaction logic for MainWindow.xaml /// </summary> public

Ok... this has me stumped. I've overridden OnContentTemplateChanged in my UserControl. I'm checking that the value passed in for newContentTemplate does in fact equal this.ContentTemplate (it does) yet when I call this... var textBox = this.ContentTemplate.FindName("EditTextBox", this); ...it throws the following exception... "This operation is valid only on elements that have this template applied." Per a commenter in another related question, he said you're supposed to pass in the content presenter for the control, not the control itself, so I then tried this... var cp = FindVisualChild