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. 

Add the option to display folder shortcuts in OpenFolderDialog and to dereference links.

Currently dialogs provide only custom places pane. 

Add auto-populated built-in section with well-known quick access like in the MS file dialogs.

Expose an event that allows you to cancel the navigation to a folder. For example, if you enter an address in the breadcrumb, click the back button, or select a directory in the navigation tree, then you should be able to cancel the navigation.

This can be done via a new event that have a Cancel property in its arguments, for example.

The naming shown here is not mandatory.

Add a mechanism that allows show/hide the context menu that opens when you right click on an empty space in the dialog. For example, you should be able to hide the "New Folder" or "Properties" options.

Currently, the icons are collected from the OS. Add an API to allow using custom icons that the developer can provide.

RadOpenFileDialog does not update FilterIndex

The RadOpenFileDialog has a property FilterIndex to get or set the index of the currently selected filter. Setting the index works fine. However, the property is not updated when the user selects a different filter. FilterIndex will always keep the value that was initially set. This is quite annoying, as we want that our customers find their most recently used filter index pre-selected.

The same problem exists for InitialSelectedLayout, which is never update either. .Net Framework's OpenFileDialog restores the most recently selected view automatically.

FileDialogs version is 2019.1.116.45

Provide a way to create custom Confirm dialog when overriding a file in SaveFileDialog.

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.

It would be nice to have some additional public properties and commands for ExplorerControl.  For example:

• Boolean properties to show/hide the first two rows (containing the breadcrumbs, new folder button, layout combo box, etc.).
• Search command or public SearchText property.
• Cancellable OnNavigating event.
• Navigation tree "RootDirectory" property, which would replace the top-level "This PC" node.

Thanks for your consideration!