c# - Set Focus in VisualStatemanager -

i write custom control , want set focus on control in case visualstate goes active.

the control kind of combobox search box in drop down popup. when open it, opened visual state goes active , search box should focused. besides dependency property bool isdropdownopen true.

ps: it's windows 10 uwp project.

sorry, can set focus programmatically, not visual state :(