mvvm-light

I am looking for an example of how to implement the property IsEnabledChanged of the dataform using MVVM light, I set up the triggers but not sure about the implementation. So, here is the code behind version: void DataForm_IsEnabledChanged(object sender, DependencyPropertyChangedEventArgs e) { if (!IsEnabled) { VisualStateManager.GoToState(DataForm, "Disabled", true); } else { VisualStateManager.GoToState(DataForm, "Normal", true); } } DataForm.IsEnabledChanged += new DependencyPropertyChangedEventHandler(DataForm_IsEnabledChanged); in xaml using MVVM light I did this: <i:EventTrigger

I have a menu in MainViewModel, now on selection of a particular menuItem I wanted to update data of a view which is already loaded. i.e. although there's an instance of that viewModel in MainViewModel, when I try to invoke the method thru that instance and change the data property, it doesnt show the changes in the view. Whereas same changes occur when I invoke that method through relay command using a button on that viewModel's view. Now its like I need to invoke relay command of that viewModel from MainViewModel, I guess that will fix the problem, but how to do that? what's easiest way.

I'm running VS 2010 along with Expression Blend 4 beta. I created a MVVM Light project from the supplied templates and I get a System.IO.FileLoadException when I try to view the MainWindow.Xaml in VS 2010 designer window. The template already references System.Windows.Interactivity. Here are the details of the exception: System.IO.FileLoadException Could not load file or assembly 'System.Windows.Interactivity, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. Operation is not supported. (Exception from HRESULT: 0x80131515) at System.Reflection

Is there a way to hook up the BackKeyPressed event to a command in a view (XAML)? I'm using MVVM Light. I have a few login/signup screens that can possibly be shown. If they're in the login/signup process, which is just showing/hiding user controls, I want to be able to intercept the back button so I can show/hide the appropriate control. Note that I'm not familiar with WP7 development, but I believe MVVM Light handles WPF4 & WP7 similarly: <PhoneApplicationPage xmlns:Command="clr-namespace:GalaSoft.MvvmLight.Command;assembly=GalaSoft.MvvmLight.Extras.WP7" xmlns:Interactivity="clr-namespace

I have a Windows Phone 8.1 MVVM Light project and I am struggling to keep it Blendable . As I see it I have a few options. I can load different view models depending on whether ViewModelBase.IsInDesignModeStatic is true in the ViewModelLocator constructor, or I can test ViewModelBase.IsInDesignModeStatic in the view model constructor and load data appropriately. If ViewModelBase.IsInDesignModeStatic is true I need to load data from file. Here's my code: public async Task<ThingsSampleDataSource> GetSampleDataAsync() { if (_DeserializedThingsSampleDataSource == null) { var dataUri = new Uri(

I'm using the MVVM Light Toolkit. I could not find any Ctor of Messenger or Notification class to send a empty message. ViewModel1: private int _selectedWeeklyRotation; public int SelectedWeeklyRotation { get { return _selectedWeeklyRotation; } set { if(_selectedWeeklyRotation == value) return; _selectedWeeklyRotation = value; this.OnPropertyChanged("SelectedWeeklyRotation"); if(value > 1) Messenger.Default.Send(); } } ViewModel2: Ctor: Messenger.Default.Register(this, CreateAnotherTimeTable); private void CreateAnotherTimeTable() { } I just need to send a Notification to another ViewModel, no