Workaround:
Toggle the fullscreen mode of the editor by adding the "editor.toggleScreenMode()" method two times at the end of the following callback, located in this JavaScript file ("C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\wpresources\RadEditorSharePoint\7.6.1.0__1f131a624888eeed\Resources\SPEditorTools.js")

configObj.ReturnCallback = function (url, text, config, newAsset) {
    elemLink.href = assetPickerValue.value;
    document.body.removeChild(assetPickerValue);
    if (inserting && url) {
        var images = elemLink.getElementsByTagName("img");
        var textContent = elemLink.innerText != null ? elemLink.innerText : elemLink.textContent;
        if (textContent === "" && (!images || !images.length)) {
            if (linkContent.match(/</)) {
                Telerik.Web.UI.Editor.Utils.setElementInnerHtml(elemLink, linkContent);
            }
            else {
                var textNode = elemLink.ownerDocument.createTextNode(linkContent || text);
                elemLink.appendChild(textNode);
            }
        }
        if (editorSelection) editorSelection.selectRange(currentRange);
        editor.pasteHyperLink(elemLink, "InsertLink");

//WORKAROUND:
        if (editor.isFullScreen() == true) {
            editor.toggleScreenMode();
            editor.toggleScreenMode();
        }
    }
};

The issue is reproducible with RadAlert, RadConfirm and RadPrompt dialogs without setting Behavior Move and DestroyOnClose="true"

When user clicks on e.g., bold text, comment, link, etc. the UI of RadEditor is not updated

Possible workaround is using the Window's Show event to attach a handler, that re-attaches the mouseup event of RadEditor with setTimeout:

<telerik:RadWindowManager runat="server" ID="RadWindowManager1">
    <Windows>
        <telerik:RadWindow runat="server" ID="RadWindow1" VisibleOnPageLoad="true" Width="800px" Height="500px" OnClientShow="OnClientShow">
            <ContentTemplate>
                <telerik:RadEditor ID="theEditor" runat="server" Width="100%" Height="100%" EnableComments="true">
                    <TrackChangesSettings Author="RadEditorUser" UserCssId="reU1"></TrackChangesSettings>
                    <Content>
                        <h2 class="titleText">RadEditor for ASP.NET AJAX</h2>
                        <p style="text-align: justify;"><span style="font-size: 19px; color: #4f6128;"><strong>RadEditor</strong></span>
                        is not simply an <strong>
                        <span class="reComment reU1" author="RadEditorUser" comment="comment 1" title="RadEditorUser: comment 1: 6/12/2015, 11:27:35 AM" timestamp="1434097655291">HTML</span></strong>
                        Editor.
                        <a href="http://www.telerik.com/products/aspnet-ajax/sharepoint.aspx">Link</a>.</p>
                    </Content>
                </telerik:RadEditor>
            </ContentTemplate>
        </telerik:RadWindow>
    </Windows>
</telerik:RadWindowManager>

<script type="text/javascript">
    function OnClientShow(sender, args) {
        var editor = $find("<%= theEditor.ClientID %>");

        window.setTimeout(function () {
            editor.attachInternalHandler("mouseup", function () {
                editor.raiseEvent("selectionChange");
            });
        }, 0);
                
    }
</script>

Despite the fact that keyboard support is not supported with RadEditor, JavaScript error should not be thrown in such a situation.

You can workaround this by following this example code to override the method related to the error:

<telerik:RadEditor ID="RadEditor1" runat="server" EnableAriaSupport="true">
</telerik:RadEditor>

<script type="text/javascript">
    Telerik.Web.UI.EditorDropDown.prototype.hide = function () {
        if (this._popupBehavior) this._popupBehavior.hide();
        this._popupVisible = false;

        //Notify controller that tooltip was hidden
        this._getPopupVisibilityController().notifyPopupClosed(this);

        //Notify listeners for the dropdown being hidden
        this.raiseEvent("hide");

        if (this._popupBehavior && this.get_enableAriaSupport()) this._popupElement.setAttribute("aria-hidden", "true");
    };
</script>

A sample project for reproducing the issue is attached:

Each of the pages in the ContentUrl properties has an alert("PageName") displayed at pageLoad.

1, Brows the Default.aspx - an alert - page1 occurs

2. Select Level 2 tab, which would load the subTab - Page4 and the "page4" alert should be shown.

Problem : In addition to the "page4" alert - the "page5" alert is raised and the page5.aspx had been loaded along with page4.aspx.

----------------------------------

Workaround:
To workaround this issue, set the PageViewID property of the parent tab to be with the same value as the PageViewID property on the selected child tab.

<telerik:RadTabStrip runat="server" ID="RadTabStrip1" MultiPageID="rmpPages" Width="100%">
    <Tabs>
        <telerik:RadTab Text="Level 1" Selected="true" PageViewID="page1">
            <Tabs>
                <telerik:RadTab Text="Page 1" PageViewID="page1" Selected="true" />
                <telerik:RadTab Text="Page 2" PageViewID="page2" />
                <telerik:RadTab Text="Page 3" PageViewID="page3" />
            </Tabs>
        </telerik:RadTab>
        <telerik:RadTab Text="Level 2" PageViewID="page4">
            <Tabs>
                <telerik:RadTab Text="Page 4" PageViewID="page4" Selected="true" />
                <telerik:RadTab Text="Page 5" PageViewID="page5" />
                <telerik:RadTab Text="Page 6" PageViewID="page6" />
            </Tabs>
        </telerik:RadTab>
    </Tabs>
</telerik:RadTabStrip>

<telerik:RadMultiPage runat="server" ID="rmpPages">

    <telerik:RadPageView runat="server" ID="page1" ContentUrl="page1.aspx" Selected="true" />
    <telerik:RadPageView runat="server" ID="page2" ContentUrl="page2.aspx" />
    <telerik:RadPageView runat="server" ID="page3" ContentUrl="page3.aspx" />
    <telerik:RadPageView runat="server" ID="page4" ContentUrl="page4.aspx" />
    <telerik:RadPageView runat="server" ID="page5" ContentUrl="page5.aspx" />
    <telerik:RadPageView runat="server" ID="page6" ContentUrl="page6.aspx" />

</telerik:RadMultiPage>

The grid adds the correct Aria-Selected attribute, but JAWS does not work

I have 2 ideas for teleriks control future, i will love to have a 3D graphics in charts for AJAX ASP.NET controls, the infragistics control have some interesting thinks on this ways. my second idea will be a control that can be used to migrate information for excel to a database in our aplications as you can do in the SQL Integration Services.

This leads to possibility for the end-user to press the button before selecting the content area and accept/reject tracked content. 

This can be resolved via some custom code that disables the tools on initial load. For example:

<telerik:RadEditor runat="server" ID="RadEditor1" OnClientLoad="OnClientLoad"
    EnableTrackChanges="true" TrackChangesSettings-CanAcceptTrackChanges="false">
    <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 OnClientLoad(sender, args) {
        var editor = sender;
        var toolNamesToDisable = ["AcceptTrackChange", "RejectTrackChange",
            "AcceptAllTrackChanges", "RejectAllTrackChanges"];
        var canAcceptChanges = editor.get_canAcceptTrackChanges();

        if (!canAcceptChanges) {
            for (var i = 0; i < toolNamesToDisable.length; i++) {
                var toolName = toolNamesToDisable[i];
                editor.getToolByName(toolName)
                    .setState(Telerik.Web.UI.Editor.CommandStates.Disabled)
            }
        }
    }
</script>

When end-user changes the font-name and size of a single word in the content, pressing spacebar resets the formatting to its default state. 

Steps to reproduce:

    1. Go to http://demos.telerik.com/aspnet-ajax/editor/examples/overview/defaultcs.aspx;
    2. Remove all content and add a simple sentence, e.g., "some text";
    3. Highlight "text";
    4. Change font-name and size;
    5. Put the cursor right after "text"
    6. Press spacebar (add white space)
    7. Type another word.

Enabling Fluid behavior of RadEditor (Width="100%") causes the tools not to collapse with a smaller view-port. Also, there are some further visual glitches with the toolbar.

Solution 1: Add a CSS rule to expand the height of the tool-groups automatically.

    .<SkinName>.reToolbar {
                height:auto !important;
    }

Solution 2: Enable Lightweight rendering (or Auto).

    <telerik:RadEditor ID="RadEditor1" Skin="Silk" RenderMode="Lightweight" runat="server" Width="100%" >
    </telerik:RadEditor>

The issue is caused by a bug in the KB3057839 windows update. The bug has been reported to Microsoft and can be tracked at the following link:

https://connect.microsoft.com/VisualStudio/feedback/details/1475291

Currently the only workaround is to revert the KB3057839 update on the production server.

Cursor is placed in the next available element (e.g., <p>) instead of being placed right after the tab space in the same paragraph.

Possible workaround is to implement a custom command to be triggered with tab key press:

<telerik:RadEditor runat="server" ID="RadEditor1" OnClientLoad="OnClientLoad">
</telerik:RadEditor>

<script>
    Telerik.Web.UI.Editor.CommandList["MyInsertTab"] = function (commandName, editor, oTool) {
        var utils = Telerik.Web.UI.Editor.Utils;
        var selecedElm = editor.getSelectedElement();
        var blockElm = utils.isBlockElement(selecedElm) ? selecedElm : utils.getBlockParent(selecedElm);
        var executeDefaultCommand = utils.isList(blockElm) ||
                                    utils.isTag(blockElm, "LI") ||
                                    utils.isTag(blockElm, "TD") ||
                                    utils.isTag(blockElm, "TH");

        if (executeDefaultCommand) {
            editor.fire("InsertTab");
        } else {
            editor.pasteHtml("<span>&nbsp;&nbsp;&nbsp;&nbsp;</span>&#8203;", commandName);
        }

    };

    function OnClientLoad(editor, args) {
        var shortcutManager = editor.get_shortCutManager();
        // Removing the InsertTabMozilla shortcut will 
        // assure that in Firefox the behavior will be consistent with IE.
        shortcutManager.removeShortCut("InsertTabMozilla");
        editor.addShortCut("MyInsertTab", "TAB");
    }
</script>

Workaround:
<telerik:RadEditor ID="radEditor1" runat="server" EnableTrackChanges="true"
	TrackChangesSettings-CanAcceptTrackChanges="true">
	<Content>
		<table>
			<tbody>
				<tr>
					<td>test</td>
					<td>test</td>
				</tr>
			</tbody>
		</table>
		<p>test paragraph</p>
	</Content>
</telerik:RadEditor>

<script type="text/javascript">
	(function ($T) {
		var prototype = $T.Editor.DefaultToolAdapter.prototype;
		var onContextMenu = prototype.onContextMenu;
		prototype.onContextMenu = function (e) {
			var editor = this.get_editor();
			if (!editor.get_enableTrackChanges()) {
				return onContextMenu.call(this, e);
			}
			if (!this._contextMenusEnabled || editor.get_mode() != $T.EditModes.Design) {
				return;
			}

			this.createContextMenus();
			var element = editor.getSelectedElement() || e.srcElement;
			var contextMenus = this._contextMenus;
			var contextElement = $T.Editor.Utils.getElementParentByCondition(element, function (node) {
				return !!contextMenus[node.nodeName];
			});
			var contextMenuId = contextElement ? contextElement.nodeName : "*";
			var parentTrackChangeEl = $T.Editor.TrackChangesUtils.findTrackChangesParentElement(element);
			if (parentTrackChangeEl) {
				if (parentTrackChangeEl.Type == $T.Editor.TrackChangesElementType.Comment)
					contextMenu = this.createContextMenuWithTrackChangeCommentItems(contextMenuId);
				else
					contextMenu = this.createContextMenuWithTrackChangeItems(contextMenuId);
			}
			else {
				contextMenu = this.createContextMenuWithTrackChangeDefaultItems(contextMenuId) || contextMenus[contextMenuId];
			}
			if (contextMenu) {
				contextMenu.set_eventObject(e);
				contextMenu.show();
			}
			return $telerik.cancelRawEvent(e);
		};
	})(Telerik.Web.UI)
</script>

In Visual Studio 2015 Pro justmock generates this error error MSB6006: "vbc.exe" To function properly you need to uninstall VS2015 justmock.

Bye