Should be simple, but it just doesn't show

I have the latest version of telerik

This is a MVVM helper that could be used to decrease the coupling between the view models.

A project with problems in RadTreeListView in the attachment.

Description of the project:

The element RadTreeListView have the name ObjectsTree.  As the ItemsSource of ObjectsTree set the child elements of ObjectsTreeViewModel. ObjectsTreeViewModel contains child elements of type ParentNode. The elements of ParentNode have childrens with type ChildNode. (In the project are used 3 ParentNode elements with 3 childNodes at everyone).

ChildNode elements that have the property ShowNode  equals false should not be displayed. To do this, used the FilterDescriptor. The property IsConnected of ChildNode elements sets the ShowNode property (ShowNode = IsConnected).

The button "Node to offline" is used to reset a property IsConnected to the selected ParentNode element and to all of his children.
The button "All Nodes to online" is used to set a property IsConnected to the all ParentNode elements and to all of their children.
The button "Check Memory Leak" is used update ObjectTree 10000 times.
If you check radiobutton "With Rebind" update using Rebind() command
If you check radiobutton "With clearing filter" update using command sequence : FilterDescriptors.Clear -> FilterDescriptors.Add.

Description of the problem:
1)	When updating the tree using the sequence of commands FilterDescriptors.Clear (); FilterDescriptors.Add (...):
The visual element displays the elements of tree correctly, but there is a memory leak.

2)	When updating with Rebind ():
Memory leaks are not present, but we may see following bug:
Select ParentNode.
Press the "Node to offline" button      -> The child elements are hidden, but a triangle for expanding the list elements is visible.
When you click on this triangle            -> it disappears
Press the button "All Nodes to online" ->the children and the triangle do not appear.

We provide such properties in our Green theme and they make customizing the read only states of all controls easier.
Currently the read only state looks like disabled and there is no easy way to change it. 

When I scroll around in RadVirtualGrid, I get empty cells in some places.

Details:
- I set InitialRowCount=21 and InitialColumnCount =17.
- The window that contains the VirtualGrid is rather small, so that the horizontal and vertical scrollbars are visible.
- I can always reproduce this issue, if I scroll completely to the right, then completely to the bottom and then half-way to the left.
- I found out that the CellValueNeeded event is never called with the indexes for these cells.
- I'm using version 2017.2.614.45 (NoXaml) of UI for WPF.
- I attached a screenshot showing the empty cells and my example project.

Hi support,
I've mixed RibbonWindow Sample and Prism with ReagionManager and RadDocking in this sample. When I try to dock a derived RadPane (e.g. OutputView or others) in center of the compass menu the derived RadPane Header is not shown as a tab in the split container. Only pure RadPane instances  (c.f. "_regionManager.RegisterViewWithRegion("DockingRegion", typeof(RadPane)); " in FileServicesModule class will dock in correct manner. 

The event args for the RadDocking.ActivePaneChanged are named "ActivePangeChangedEventArgs" which I'm assuming is a typo for "ActivePaneChangedEventArgs".

Available in LIB version 2018.1.312.

It would be nice if the Telerik UI for WPF VSExtensions detected usage of UI for WPF in class libraries (e.g. a WPF UserControl Library)..

This would allow the Upgrade Wizard / configure Project wizards can also work on the class libraries, too.

Enable the customers to create and modify .pptx (PowerPoint) files . They need processing as well as showing such documents.

Improve the support for async operations. Currently, if the db data context is shared between the collection and another consumer, issues could occur.

When new product features are released it would be useful to show a short introduction for users.  View introjs.com to see a similar solution for web development

I know you added a sample (https://github.com/telerik/xaml-sdk/tree/master/Buttons/ToggleSwitchButton) but please include this in all your Theming dll.

We use 'xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"' in our application.
The problem is that DrapAndDrop does not work anymore, no Events are fired.

Since our last release we didn't change anything at our UI and as I tried a few days ago to drag something in the application and nothing happened.

Did something change with the previous mentioned reference?
What are possible solutions?

Thank you in advance 

I have a diagram with about 45 custom image objects contained within it. When I export the diagram to a png using RadDiagram.Export("PNG") there are 3 images that are not rendered in the image.

When setting IsSynchronizedWithCurrentItem to true, the RadListBox behaves differently from the standard ListBox; changing the selection in the RadListBox does not update the current item of the underlying ICollectionView.

Add a property to the RadWindow, to enable a behavior, so that when the user attempts to focus on the parent window (while the modal is open), the modal window will flash.

You can see this behavior in other Windows applications that show modal dialogs.

Currently if a column is bound to a field of type DateTimeOffSet it is not displayed using the culture like DateTime is. It would be nice if this is supported in the future

Make the internal static class Telerik.Windows.Controls.WeakEventHandlerManager public.

In Excel it's easy to rotate the contents of a cell. In the Gridview, it's possible to rotate the contents of the header, but the result is a column header that resizes weirdly, and the workaround (at least the one I was provided) is clunky. How about a simple property like <telerik:GridViewDataColumn Header="Name" HeaderRotation="-90" />