this is not related only to grid-inside-grid scenario (HierarchyChildTemplate), but also for a flat (classic) grid control. If you have a GridView and any other control (ex TextBox), you will notice that if you move focus from GridViewCell to TextBox, both

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.

The RowStyleSelector is great for dynamically styling rows, but there doesn't seem to be an easy way to dynamically apply a style to selected rows - they just take on the default style. Something like a SelectedRowStyleSelector would be a great way to dynamically style selected rows. Thanks!

The built-in export capabilities for the RadGridView are clunky and not well though out. Additionally, it doesn't fully support exporting hierarchical child data. (You can do it, but you have to go through a good bit of song and dance for something that I've seen other tool sets do automatically.)

I'd like to see the option fully baked that doesn't require code-behind (allowing an MVVM approach). And asynchronous methods that uses standard async-await conventions.

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.

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.

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

Add a property to control GridView ControlPanelItem visibility.

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

If in the content of RadGridView.ControlPanelItem has a binding with a RelativeSource or ElementName and the grid is placed in the collapsed UserControl, a binding error is thrown in the output window.

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

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

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

Currently the filters for the RadGridView only allows 2 filters. It would be very helpful for the default filter popout to have the option to add additional filters.

Current filter popout:

 

Filter popout with ability to add additional filters via an Add Filter button:

Competitor's GridView controls have this feature already and it would be very useful to have this feature on the RadGridView control. 

Currently, when a user selects multiple rows, but skips a few, and then copies, the data in the Clipboard will look as if the selected rows were in an uninterrupted sequence. Unselected columns, on the other hand, leave a "hole" in the clipboard data. This

Add Option to disable autoBring into View the focused RadGridView unit.