1) Launch the RadRichTextEditor
2) Create  a new file
3) go to insert tab and hit "Header" icon (Header & Footer section)
4) Notice the caret blinks on the top left corner of the document
5) Enter some text for ex: zzzz and notice text entered doesn't show up
5) At this point when you double click outside the header section the whole header and footer section is lost
6) Now double click on the header section again even though the header section is not visible. Still the entered text is not displayed and notice the cursor blinks at the top left corner of the header section
7) Press enter key, now the entered text is displayed. 

Can't see undo and redo button on the editor.

Steps:
1) Launch the RichTextEditor
2) Clear the existing contents or open a new file (using File-> New)
3) Insert a table of any dimensions for ex: 2x2
4) Delete the above added table
5) Now try to insert a new table of any dimensions (For ex: 2x2)
6) You will get the following exception when you run the project using vs2010
Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index
7) In the demo application , you will see a Form1 error pop up opens up and makes the RichTextEditor completely blank

Steps:
1) Launch The RichTextEditor
2) Clear all the existing content
3) Type some text for ex: zzzz
4) Select the whole text and try to hit the backspace 
5) The typed text is not cleared and even you keep hitting the backspace the text is not cleared sometimes, it just stays

Launch the RichTextEditor
1) Click the find and replace button on the ribbon bar
2) Close the find and replace dialog box
3) click the find/replace button again , the form doesn't open up