Add NoResultsContent and NoResultsContentTemplate properties to the RadComboBox control. 

Currently filtering with virtualized RadComboBox is not supported as the filtering feature works with the containers (changes their Visibility).

Currently, the drop down of RadComboBox contains only the RadComboBoxItems and the Clear Selection button. Add new content presenter that allows you to include extra visuals, like buttons or text.

The feature is similar to the AdditionalContent of RadTabControl. 

The RadComboBox control could provide SelectAll button or template functionality. This way the user can choose whether to use the default button or create a custom select all behavior.

Currently, the first filtered item of the control is selected once a search (with IsTextSearchEnabled=True) is performed. Users should be able to control whether this happens or if the selection needs to be skipped.

Currently, the EmptyText is shown in a TextBlock which cannot be customized. Add a EmptyTextContent or EmptyTextVisualStyle properties to allow customizing the UI of the empty text. 

The RadListBox has an attached property for mvvm binding of SelectedItems - https://docs.telerik.com/devtools/wpf/controls/radlistbox/features/selecteditemssource.

 

Please support SelectedItemsSource for RadComboxBox too.

Currently the control scrolls by group.

This would provide the option to stop the auto scrolling when the last item is hovered.

Enable the ComboBox to open its DropDown in up as well as down direction

When "TextSearchMode" is set to "Contains", IsEditable="True" and IsReadOnly="True": it should be possible to select all or some of the text and by pressing delete or backspace the selected text should be removed.

The combobox lists in Windows 10 settings (see attached pictures) have an interesting behavior which could be integrated by Telerik combox controls. The behavior is as following: when the listbox is opened, it appears above the combobox control with the selected item highlighted. And the placement of the listbox can change if the first item is selected (displayed down direction) or the last item is selected (display up direction).

It's difficult to explain that with simple words, so I suggest to see attached pictures to understand my request.