I have a handler consuming the keyDown event of a WinForms RTB, that has the following code:

GetTextAtLoc(RTB->SelectionStart); // selects some text at the caret's position
RTB->SelectedText = "SomeOfMyOwn";
GetTextAtLoc(RTB->SelectionStart); // selects the replacement string
RTB->SelectionStart += RTB->SelectionLength - 1;

While this code seems to do its job (SelectionStart/Length properties are updated correctly), the caret doesn't move to the end of the new string - It says right where it was at the time of GetTextAtLoc's first call. Redrawing the textbox does seem to have any effect either.