When two columns in two separate column groups have the same name and they belong two separate column groups, the column group names of the parent column groups can be appended to the display content of the GridViewGroupPanelCells.

For example, the duplicate Code columns in the attached image should have content "PG Code" and "VENUE Code" respectively.

Blind users or users with visual impairments can only hear the unlocalized (english) text in the RadGridView Filter when using ScreenReaders.

Add a property to control GridView ControlPanelItem visibility.

The new properties will be available with Q2 2016. 

When Unicode characters are copy pasted from grids via CTRL + C and then pasted into Excel or Word (for example) as a HTML table, it seems like for every Unicode character a certain amount of bytes / characters are cut off from the end result.

A property like FilterMemberPath could be created. This way, we can control which property will be used by the Search As Type functionality.

Allow setting the group header rows height with a property similar to the RowHeight property of RadGridView. For example, a new GroupHeaderRowHeight property can be introduced. The new property should be included also in the UI virtualization calculations. 

There is not a dedicated UI that allows hiding showing columns. You can achieve this using Control Panel functionality.

By default, the RadGridView will expand its rows to fit whatever the size of the text content. If you have a large amount of text with newlines, it essentially renders the grid unusable in this state.

The thread http://www.telerik.com/forums/limit-row-height suggests two workaround: 1) using a converter to remove newlines- this is a bad solution because it means the binding on the column must be one-way. 2) Applying styling to the grid's textblock- also not great because its non-obvious and requires a lot of boilerplate.

My suggestion is two properties on the RadGridView: MaxRowHeight and MultilineRowContentBehavior. This second property would determine what happens when a row has multiline content and would take an enumeration: SizeHeightToContent- the current behavior. SingleLineExpandOnEdit- when displaying, shows only a single line of the multiline content. When editing, expands the TextBox to fit the content. SingleLine- displays and edits the content in a single line.

The vertical scrollbar of RadGridView disappears in some cases when the last parent item is expanded and then collapsed. The issue reproduces only with the Flat GroupRenderMode and when UseLayoutRounding property is set to True.

The workaround is to avoid setting the UseLayoutRounding property to True.

 

When the ScrollMode is set to Deferred, then only the vertical ScrollBar shows a position indicator. The same is requested on horizontal scrolling.

The exception occurs when DBSet<T> is used with a Select query that creates new objects of type that is not included in the EDMX model. The issue appears because the internally used IQueryableCollectionView calls OfType<T>() on the IQueryable which is not allowed in the specific setup.

The exception is the following: "TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.NotSupportedException: 'WpfApp4.MainWindow+MyClass'is not a valid metadata type for type filtering operations. Type filtering is only valid on entity types and complex types."

To work this around, you can call ToList() over the IQueryable object before pass it to RadGridView's ItemsSource.

Columns data gets overlapped when columns are hidden and shown again

Apply sort/filter/group. Add option so that user can disable the UI update and be able to add new items, remove existing ones, change values so that UI is not updated. For example new item is on top of the sorted ones. Edite item does not change its place until sorting is reapplied/ resumed.

Add a textbox which allow search and filter functionality for the distinct values in the FilteringControl of RadGridView.

In the meantime, you can check the attached project that shows one way to achieve this.

The default merging algorith merges adjacent cells with the same value. An option for preventing cells merging despite their value, should be provided.