Add API that allows to customize the files/folders search action. Currently, the searching happens on all subfolders starting from the current directory. Allow the user to change this and search only in the current folder.

FileDialogs are constructed by RadWindow and ExplorerControl as its content. 

Explorer control holds navigation tree, autocomplete, filtering combobox, main pane for viewing fodler and files, search box, breadcrumb. You can check all visual parts in the following help article:

http://docs.telerik.com/devtools/wpf/controls/radfiledialogs/visual-structure

Users might need to put the ExplorerControl in non-window parts of their application (for example in docked RadPane of RadDocking. Also, they might need to override OK/Cancel commands for that purpose.

Add rectangle selection in multiple/extended selection mode just like in Windows Explorer.

Show the actual image when the layout of the main pane is set to Medium, Large and Extra Large Icons.

Provide built-in support for the following combinations:

• Move to the previous folder:  Backspace or Alt+Left Arrow combination
• Move to the next folder: Alt+Right Arrow combination
• Change layout: Ctrl + Mousewheel combination

Currently, you can select and deselect files and folders only through the UI. There are no methods or properties that allows to do that manually. Add such API.

Currently, when the RadFileDialogs control is opened in a remote session, redirected drivers from the local machine will not be shown in the control. We could add an option to show the drivers from the local machine, which are chosen to be used in the remote session.

Currently, double click on a file in the ExplorerControl starts the renaming action. Allow changing this behavior. The possible modes could be rename, execute file and do nothing. 

Note that also the context menu of the file should reflect the mode. Currently, the menu shows the default action based on the file extension as a bold text option. For example - "Open" or "Install". This is inconsistent with the default behavior where the file gets renamed (instead of opened). Ensure that the context menu bolding is updated accordingly.

Add an API that can be used to cancel or modify the editing of files and folders. For example, you can introduce Editing and Edited events for the dialog which can be fired when the selected file goes into edit mode and after the editing is committed.

Currently, the RadFileDialogs does not provide an API option for applying additional filtering of the already filtered files.

We could extend the filtering functionality of the RadFileDialogs control.

Add a "New Folder" option in the TreeView pane's shell context menu.

If the OneDrive folder is available, display it in the navigation tree of the ExplorerControl.

Currently, this can be done manually by adding the OneDrive directory in the CustomPlaces collection of the dialog.

Currently, the root of the file system is "This PC". Allow setting a custom folder as a root (for example, C:\Users\mivanov\Documents) and show only its children.

Add support for respecting the Group Policy settings in order to hide the specified drives.

Add an API that allows you to access the columns of the corresponding FileBrowserGridView control (representing the Details layout) so you can add different settings. Or alternatively provide some property abstraction to propagate properties from the file dialogs API to the internal RadGridView columns API.

Like in MS Win 32 OpenFileDialog - thumbnails with preview or details about the selected file.

Check the attached images for better clarification.

Currently, showing a dialog can take 10-20 seconds when started in DEBUG mode. 

And 3-5 seconds RELEASE mode. Improve the loading time.

A little way to speed up is to set ExpandToCurrentDirectory to False.

Add shortcuts for accessing different elements on the UI - the search bar, the file name input, the buttons, etc. 

Currently, when there is an existing file with the same FileName as the chosen from the user, a dialog is shown asking for confirmation. We should provide a way to skip the showing of this dialog.