http://demos.telerik.com/aspnet-ajax/editor/examples/contentareamodediv/defaultcs.aspx

1. Delete the content
2. Choose AutoResizeHeight from the Configurator

Expected: The contentarea's height equals its wrapper

http://demos.telerik.com/aspnet-ajax/editor/examples/overview/defaultcs.aspx

       1. Insert the following html:
<div style="float: left;">
<img alt="" src="/aspnet-ajax/Editor/images/UserDir/Marketing/Tokyo.png" />
</div>

        2. Click the image and update it via ImageManager

Expected:

<div style="float: left;">
<img alt="" src="/aspnet-ajax/Editor/images/UserDir/Marketing/upload_100.png" />
</div>

Actual: 

<div style="float: left;">
</div>
<img alt="" src="/aspnet-ajax/Editor/images/UserDir/Marketing/upload_100.png" />

RadScheduler Server-side PDF Export does not support Lightweight render mode, as specified in the respective help article:
http://docs.telerik.com/devtools/aspnet-ajax/controls/scheduler/export/pdf/overview.html

The Image Map Dialog is not rendered correctly because of a failure of the CSS reset. There is a margin-top attribute which is set with 15px value instead of 0.

Possible resolutions:
 1. Setting another Skin for the RadEditor control;
 2. Setting a custom stylization for the dialogs, which fixes the margin issue. For this approach you can test this example setup along with the provided DialogStyle.css file:

<telerik:RadEditor ID="RadEditor1" runat="server" 
	DialogsCssFile="~/Styles/DialogStyle.css">
</telerik:RadEditor>

More information about the DialogsCssFile property: http://www.telerik.com/help/aspnet-ajax/editor-dialogscssfile.html

Workaround:

<script>
    var $ = $telerik.$;
    Telerik.Web.UI.RadMenuItem.prototype._doAriaFocus = function () {
        var menu = this.get_menu();
        var menuId = menu.get_id() + "_active";

        $(this.get_element()).attr("id", menuId);
        $(menu._getMainElement()).attr("aria-activedescendant", menuId);
    }
</script>

The NewLine command behave inconsistently across browsers and causes different incorrect content generation in IE, Chrome and Safari.

 - In IE - New lines are added, but the cursor stays in the initial/first line. This issue also causes an performance problems when typing and pressing Enter with regular speed.

 - In Chrome - Pressing Enter causes mixed content of tracked and not-tracked text to appear without toggling the state of the Track Changes. Also, adds an empty INS tag in from of the new line.

 - In Safari - Adds an empty INS tag in from of the new line.


For the time being you can incorporate the JavaScript code from the following example:

<telerik:RadEditor runat="server" ID="RadEditor1" EnableTrackChanges="true">
	<Tools>
		<telerik:EditorToolGroup>
			<telerik:EditorTool name="AcceptTrackChange" text="Accept Track Change" />
			<telerik:EditorTool name="RejectTrackChange" text="Reject Track Change" />
			<telerik:EditorTool name="AcceptAllTrackChanges" text="Accept All Track Changes" />
			<telerik:EditorTool name="RejectAllTrackChanges" text="Reject All Track Changes" />
			<telerik:EditorTool name="EnableTrackChangesOverride" text="Enable Track Changes Override" />
		</telerik:EditorToolGroup>
	</Tools>
</telerik:RadEditor>

<script type="text/javascript">
	(function () {
		var $E = Telerik.Web.UI.Editor;
		var utils = $E.Utils;
		var isTypingKey = utils.isTypingKey;
		utils.isTypingKey = function (e) {
			return e.keyCode != 13 && isTypingKey(e);
		}

		var extractFrom = $E.InsertParagraphCommand.prototype.extractFrom;
		$E.InsertParagraphCommand.prototype.extractFrom = function (cursor, container) {
			var newElement = extractFrom.call(this, cursor, container);
			if (!this.get_editor().get_enableTrackChanges() || utils.isTextNode(cursor.nextSibling)) return newElement;
			$telerik.$(newElement).find("*").each(function (index, item) {
				if ($E.TrackChangesUtils.isTrackChangeElement(item)) {
					if (utils.isTag(item, "ins") || utils.isTag(item, "del")) {
						utils.removeNode(item);
						return;
					}
					$E.TrackChangesUtils.removeNodeTracking(item);
				}
			});
			return newElement;
		}
	}());
</script>

When the data is initially grouped and later grouping is collapsed, the group does not expand on click again.
The class rgExpand does not change to rgCollapse class.

It works with Telerik.Web.UI.dll version 2014.2.618.40 (release 1/14/2016?)

However, when we upgraded to 2016.2.504.40 (release 5/9/2016?), it is stuck in "Collapse" mode. Cannot expand again in when clicked on the arrow.

We need the exactly the same control that the guys over in Silverlight have:

http://www.telerik.com/products/silverlight/expressioneditor.aspx

I am in desperate need of this control in the ASP.Net platform.

Short version:  needed for IE browsers and overlaying external plugins such as PDF

To overlay external content such as PDF in some browsers, we need just Z-index. In other, we need an iframe inside the overlay.