>>When I copy and paste contents which have picture in it and try to save it as PDF. It throws an exception to me saying that the pdf cannot be created. How to get rid of this problem?

 

Please check this demo:

 

 

>>Can we configure the editor so it won't alloca user to press Enter key from their keyboard?

No, however you can change the behaviour of enter key.

 

>>If i set the form to be invisible, when first loading, the spell checker does not work. Is it first loading the form that contain editor must set it to be visible?

 

All asp.net server controls must be included in the form tags:

 

<form id="Form1" method="post" runat="server">
</form>

 

>>Can we customise the dialog box for "Inserting hyperlink"?

 

Yes.

 

http://cutesoft.net/developer+guide/scr/Dialog_Customization.htm