The only other option you have available to you is:
this.InputFieldsVisible = TRUE
with both of those set, I expect to see what you are seeing.
Don't remember exactly, but PB version 10.5 used TX version either 11 or 13 and PB version 12.5 uses version 15, so that may be a difference between the two versions. Unfortunately, I only have PB 8, 10, 11.5 and 12.5 available on my machine, so can't test your specific situation.
Did you try InputFieldChangeData to change the value of the field you are entering?
Also, is this the RTE control or the RTE DataWindow?
Lastly, do you have any screenShots or code samples that can help to figure this out?