Adding text to an edit box

Is there any way to add text to an edit box where the curser is located. Right now if you past something it recopys all the text in the edit box and automatically puts it at the end so doesn't anyone know how to make it be placed where the curser is?

Take a look at sending the edit a EM_REPLACECURSEL. This replaces the current selection. If there is no selection it adds the text where the caret is.

- Sean