The Symbol dialog enables end-users to visually select a symbol or character insert it into the text.
You can provide end-users with the capability to invoke the Symbol dialog via the Symbols toolbar or Ribbon page group. To do this, provide Bars or Ribbon UI for the RichEditControl (see How to: Create a Simple Word Processor with a Bar UI or How to: Create a Simple Word Processor with a Ribbon UI) and create the Symbols toolbar or Ribbon page group from the Insert group of bars.
To invoke the dialog, use the ShowSymbolFormCommand command.
RichEditControl also provides a number of commands allowing you to insert different individual symbols: InsertRegisteredTrademarkSymbolCommand, InsertEmDashCommand, InsertEnDashCommand, InsertEllipsisCommand, InsertTrademarkSymbolCommand, InsertCopyrightSymbolCommand, etc.
To customize the default Symbol dialog or substitute it with completely new dialog, handle the RichEditControl.SymbolFormShowing event. To get an example of the dialog replacement, refer to the How to: Customize the Search Form or How to: Customize the Hyperlink Form document.