Implement support for content controls (a.k.a. Structured document tags), which will allow inserting editing controls in the document:

- Rich Text
- Plain Text
- Check Box
- Combo Box
- Drop-down list
- Date picker

Do not confuse this feature with form fields support (see http://feedback.telerik.com/Project/143/Feedback/Details/146869 ).

Add support for shapes, and especially for shapes with textual content. 
In OOXML, shapes are represented by the wps:wsp element, and shapes with textual content by <wps:txbx>, <w:txbxContent>.
Such shape can be added to a Word document using the Insert -> Text -> Text Box -> Draw Text Box, or through a shape's context menu -> Add Text.

Note: Do not confuse with Text/Rich Text content controls (https://feedback.telerik.com/Project/143/Feedback/Details/113730 ).

Add a way to convert between RadRichTextBox's RadDocument and RadWordsProcessing's RadFlowDocument. 

This will enable integration scenarios between the two products, including using RadWordsProcessing's format providers for import and export.

In MS Word there is a combo box for display mode of the track changes under Review tab. There is a No Markup option which hides the revisions and shows how the document will look in his final variant. Similar to accepting all revisions.

- There should be a formatting symbol for the character

- Pressing Ctrl+Shift+Space should insert the character (standard MS Word shortcut)

- Import from docx should be implemented

- The symbol should be treated as a separator between words when spell-checking

It should be possible to have several columns in a section of the document. These columns should also be persisted on export/import.

Add a way to restrict page breaks in paragraphs or page breaks between paragraphs. In MS Word, these options are named "Keep lines together", "Keep with next" and "Page break before".

Splitting table cells is currently not supported and it would be a nice addition to the functionality related to tables. Menu item should be added to the default table context menu.

Form fields are the legacy way to insert an editable controls in a document (text boxes, checkboxes, dropdowns) by using the FORMTEXT, FORMCHECKBOX and FORMDROPDOWN fields.

This includes the legacy Frames (described in OOXML with 'framePr' element).

Do not confuse with content controls (structured document tags) (see http://feedback.telerik.com/Project/143/Feedback/Details/113730 ) and with ActiveX controls.

Currently, RadRichTextBox supports the import and export of shapes from and to Office Open XML (DOCX). When exporting to PDF, the shapes are converted to images. When exporting to other formats the shapes are lost.

Add support for line numbering in paged layout mode, similar to MS Word.

RadRichTextBox doesn't support most used Chinese IMEs - QQ Pinyin and Sogou Pinyin.

Add support for comparing documents.

Currently, caret continues to blink even when typing or navigation is in progress (e.g. arrow key is pressed and held), which is inconvenient for the end users. Instead, the caret should stop blinking during these operations, similarly to industry standard apps like MS Word and OpenOffice.

Add ability to select last paragraph symbol in Section and TableCell.  Currently there is no document position after the last paragraph symbol in a document/section/table cell. This means it cannot be part of a DocumentSelection.

Introduce Navigation Pane as an enhancement to the UI of RadRichTextBox, similar to the one in MS Word (View -> Show -> Navigation pane).

Support for file formats other than .TDF is required, so that a broader range of dictionaries can be used. Consider adding support for OpenOffice dictionaries.

Add support for Paragraph and Page borders.

Note: Typing "---" in MS Word and pressing Enter inserts bottom paragraph border with special size (sz="6" in the docx format).

Workaround for inserting visually similar element:

Add a horizontal line using a table with a single border. Here is some code demonstrating how to do this:
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var document = new RadDocument();
var editor = new RadDocumentEditor(document);

Table table = new Table();
var topBorder = new Telerik.Windows.Documents.Model.Border(1, BorderStyle.Single, Colors.Red);
var borders = new TableBorders(table.Borders.Left, topBorder, table.Borders.Right, table.Borders.Bottom);
table.Borders = borders;

var row = new TableRow();
var dummyCell = new TableCell();
var dummyParagraph = new Paragraph();
dummyParagraph.FontSize = 0;
dummyParagraph.LineSpacing = 0;
dummyParagraph.SpacingAfter = 0;
dummyParagraph.SpacingBefore = 0;
dummyCell.Blocks.Add(dummyParagraph);
row.Cells.Add(dummyCell);
table.Rows.Add(row);

editor.InsertTable(table, shouldInsertParagraphBeforeTable: true);            
this.rtb.Document = document;
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Add support for nested track changes revisions. Currently, when a user tries to delete text added by another user, RadRichTextBox simply removes it and does not mark it as a change.

The customers need to convert the position to an integer number representing the offset of the current position from the first position in the document. A method returning the position at a specified offset would be useful as well.