asp.net 2 tradition server controls properties

i am carrying unequivocally tough awaiting customary settlement / best use deals digest child controls inside multiple formed ability value.

here simple scenario. i have multiple control twin child controls, textbox dropdown. lets contend there ability toggles child render.

so:

mycomposite.showdropdown = true;

if true, shows dropdown, differently shows textbox.

the ability value should saved opposing postbacks, the repremand control should displayed formed postback value.

any good examples out there?