Changing the paths of FileExplorer dynamically leads to popping an alert message for "non-existing folder" even in no InitialPath has been set. After closing the alert RadFileExplorer gets bound successfully.

video: http://screencast.com/t/NSGjo8moC5eL

The bug is introduced in version 2015.2.729.


Steps to reproduce:
1. Run the following code:
ASP:
<telerik:RadFileExplorer ID="RadFileExplorer1" runat="server">
     <Configuration ViewPaths="~/" />
</telerik:RadFileExplorer>
<telerik:RadButton ID="Btn1" runat="server" Text="Change ViewPath" OnClick="Btn1_Click"></telerik:RadButton>

CS:
protected void Btn1_Click(object sender, EventArgs e) {
    RadFileExplorer1.InitialPath = "/Bin";
    RadFileExplorer1.Configuration.ViewPaths = new string[] { "~/Bin" };
}

2. Click the "Change ViewPath" button

Result: FileExplorer shows an alert with message "You are navigating to a non-existing folder or do not have proper permissions..."

RadFileExplorer allows renaming of extentions with capital letters (e.g. IMG, PNG, etc) even if the FileExplorer's AllowFileExtensionRename="false" property is set. As a result, the renamed extension is appended to the file name, and the original ext is kept.

Video: http://screencast.com/t/MNAZqpRS4o5

Steps to reporduce:
        <telerik:RadFileExplorer ID="RadFileExplorer1" runat="server">
            <Configuration ViewPaths="~/Images" UploadPaths="~/Images" DeletePaths="~/Images" AllowFileExtensionRename="false"/>
        </telerik:RadFileExplorer>

Run the code above and try to rename a file with capital letters extension.

Moving of folder from the tree to the grid works, but event is not raised. Also, there is no other suitable event that handles the situation. 

The following patch will raise the event, but  you should make sure to remove the override once the bug is fixed: 

<telerik:RadFileExplorer RenderMode="Lightweight" runat="server" ID="FileExplorer1" EnableCopy="true"
    OnClientMove="OnClientMove" OnItemCommand="FileExplorer1_ItemCommand" >
    <Configuration ViewPaths="~/Images" UploadPaths="~/Images"
        DeletePaths="~/Images"></Configuration>
</telerik:RadFileExplorer>     
 
<script>
    var origFunction = Telerik.Web.UI.RadFileExplorer.prototype._onTreeNodeDropping;
 
    Telerik.Web.UI.RadFileExplorer.prototype._onTreeNodeDropping = function (sender, args) {
        origFunction.call(this, sender, args);
        var destNode = args.get_destNode();
        if (!destNode) {
            var destElement = args.get_htmlElement();
            if (!destElement) return;
            var gridElement = this.get_grid();
            var grid = gridElement != null ? this._isOverElement(destElement, gridElement.get_id()) : null;
            if (grid) {
                var isCopying = this._enableCopy && args.get_domEvent().ctrlKey;
                var eventName = isCopying ? "copy" : "move";
                var args2 = new Telerik.Web.UI.FileExplorerEventArgs(this.get_tree().get_selectedNode(), this.get_currentDirectory());
                this.raiseEvent(eventName, args2);
            }
        }
    }
 
    function OnClientMove(sender, ev) {
        // Do something
    }
</script>

The icon of the confirm dialogs in RadFileExplorer should be center aligned to the text.

Only half of the Select button (the top part) in Upload dialog is clickable in Material, due to the unsufficient height of the .ruFileInput element.

Workaround:
  html .rfeUploadContainer .RadUpload .ruInputs input.ruFileInput {
    height: 50px;
  }   


Steps to reproduce:
1. Open https://demos.telerik.com/aspnet-ajax/fileexplorer/examples/overview/defaultcs.aspx?skin=Material
2. Open the Upload dialog
3. Try to select a file to upload by clicking the bottom half of the button

Result: The file selection window is not opened

Reproduction code:

protected void Page_Load(object sender, EventArgs e)
{
    RadToolBarDropDown dropDown = new RadToolBarDropDown("PageSize");
       
    dropDown.CssClass = "perPageDropDown";
    dropDown.EnableImageSprite = false;
    // dropDown.Text = GetGlobalResourceObject("Insight", "Per pagina")
    // dropDown.ToolTip = GetGlobalResourceObject("Insight", "Per pagina")
    FileExplorer1.ToolBar.Items.Add(dropDown);
}

<telerik:RadFileExplorer RenderMode="Lightweight" runat="server" ID="FileExplorer1" Width="595px" Height="350px"
    AllowPaging="true" PageSize="10">
    <Configuration EnableAsyncUpload="true" ViewPaths="~/"
        UploadPaths="~/" DeletePaths="~/"></Configuration>
</telerik:RadFileExplorer>

There is a scroll and the Upload button is partially hidden when the Bootstrap skin is used in Classic render mode:

Cannot expand configuration on properties panel

No matter what the current page index is, get_currentPageIndex() will return zero if FileExplorer is used in Thumbnails mode.

FileExplorer does not scroll its tree properly to the programatically selected folders.

Steps to reproduce:

1. Set a nested folder with a long path programatically:

fileExplorer.set_currentDirectory("/images/AAA/FolderA1/FolderA2/FolderA3/FolderA4/FolderA5")

2. Select another nested folder programatically:

fileExplorer.set_currentDirectory("/images/BBB/FolderB1/FolderB2/FolderB3/FolderB4/FolderB5")

Result: The second folder is selected, but the TreeView does not properly scroll into view containing it.

It is not possible to navigate between ContextMenu items with the arrow keys when the Keyboard support is enabled.

The ThreeView remains the focused element even after the ContextMenu is shown and using the arrow keys navigates through the tree nodes instead of the ContextMenu items.

Steps to reproduce.

1. Click somewhere on the page and press "F" for focus FileExplorer
   
2. Press "T" to focus TreeView
3. Press "C" to show tree context menu
4. Pres Up/down arrow to navigate through the context menu items

Result: The navigation occurs in the three instead of the Context menu

            <telerik:RadFileExplorer ID="RadFileExplorer1" Height="380px" Width="750px"
                AllowPaging="false" EnableCopy="true" runat="server">
                <Configuration EnableAsyncUpload="true" SearchPatterns="*.*" UploadPaths="~/Images/" DeletePaths="~/Images/" ViewPaths="~/Images/"></Configuration>
            <KeyboardShortcuts
                FocusFileExplorer="F"
                FocusAddressBar="A"
                FocusToolBar="B"
                FocusTreeView="T"
                ContextMenu="C"  
                />

It is not possible to select a Toolbar item in RadFileExplorer on Enter press if the control is used in Lightweight render mode.

Steps to reproduce:

1. Open https://demos.telerik.com/aspnet-ajax/fileexplorer/examples/keyboardsupport/defaultcs.aspx

2. Press "Ctrl+f2" to focus RadFileExplorer

3. Press "Shift+1" to focus its toolbar

4. Use the Arrow keys to navigate between to Toolbar items

5. Press Enter over a button (e.g. Upload)

Result: The command is not triggered

Workaround: The issue is not reproducible in Classic render mode.

have found similar issue :  http://www.telerik.com/support/pits.aspx#/details/Issue=5296
which look like has been fixed, but unfortunately for following case it doesn't:
We still have performance issue, in following situations:
   - when content root folder contains few (1-5) subfolders
   - one of subfolder contains lot of (200-500) sub-subfolders 

then first time RadFileExplorer  loading to long (aproximatelly 3-5min). after some researching has been found that problem in the method:  

     private bool HasSubFolders(string virtualPath);

which instead of simply check that folder isn't empty (exist any one file or directory)  always construct complete version of the subtree (in the example above - subtree contains 200-500 subfolders, each of them checking for content, permission etc - that is why it takes time). Probable to check that node  HasSubFolders, RadFileExplorer  could execute new virtual method of the FileSystemContentProvider bool HasSubFolders. In that case: FileSystemContentProvider (or inherited classes) will decide that Folder contains SubFolders.