to make it not to lost focus?

Hello

I have trying to change richtextbox selfontname,selfontsize....etc properties.I have try to make a small program which can change these properties with combobox (combo1 for selfontsize,combo2 for selfontname) . I select a part of text in richtextbox then want to change its selfontsize or selfontname with combo,selected part of text become unselected.How can I stops it?I want to use it like word;select text and change property.How?Thanks...
;)

set the HideSelection property to False

Thanks,its work.