The Plainion.Windows library provides various extensions to WPF to simplify the usage and to extend of its concepts.

• BindingProxy: see How to bind to data when the DataContext is not inherited
• PropertyBinding: allows binding of viewmodel properties with eachother to automatically "forward" changes

PropertyBinding.Bind( () => vm1.PrimaryValue, () => vm2.SecondaryValue, BindingMode.TwoWay );

• TaskExtensions.RethrowExceptionsInUIThread allows rethrowing exceptions from TPL tasks into the UI thread

• FrameworkElementAdorner/AdornedControl allow putting controls (e.g. ProgressBar) into an Adorner
• CircularProgressIndicator: simple progress indicator with details and flexible progress "numbers"
• SearchTextBox: simple search box with preview
• SelectFolderDialog wrapped to be used in WPF easily

Feature rich tree control/"editor" (see RI below)

• Drag&Drop of nodes
• In-place-Edit
• ContextMenu for create and Delete
• MVVM

• RichTextEditor
  • nicer looking bullet lists
  • various AutoCorrections
    • MarkDown headlines and bullet lists
    • ASCII to Unicode conversion
• NotePad
  • Adds toolbar with search and format buttons to the RichTextEditor
• NoteBook
  • Adds tree navigation for multiple documents and storage to the NotePad

See it in production at Plainion.OneNote (including detailed feature description).

• WpfStatics collects and provides common memory leak pitfalls in WPF applications, e.g.:

Data binding to non-observable property causes memory leak
Choose one of the following options:
  a) convert to DependencyProperty
  b) implement INotifyPropertyChanged in owning type
  c) bind with BindingMode=OneTime

or

Observation of DependencyProperty using DependencyPropertyDescriptor.AddValueChanged() causes memory leak
Call DependencyPropertyDescriptor.RemoveValueChanged() to remove the event handler.

and more

Contains various behaviors to avoid code behind in MVVM apps, e.g.:

• FocusOnClickBehavior
• OpenLinkOnCtrlClickBehavior
• PanOnLMBBehavior
• RaisCommandOnMoueGetureBehavior

and more.

Provides basic and generic Drag&Drop support compatible with MVVM pattern.

• Views/ViewModels implementing IDragable can be dragged
• Views/ViewModels implementing IDropable can be drop targets
• FrameworkElementDragBehavior and FrameworkElementDropBehavior are used in the Xaml to wire up with Windows Drag&Drop events

Use the reference implementation (Plainion.RI.exe) to play around with the extensions provided by this library.