I have an issue with the editor control in the toolkit stripping out the + symbol, it has been mentioned when I googled it by another user.
http://ajaxcontroltoolkit.codeplex.com/workitem/26912

At the bottom is a possible solution but I dont understand how to apply this.

When I use the toolkit I just reference the dll.

Is it suggesting I download the source for the toolkit, edit the javascript and recomplie? Is this complicated?