Cursor Focus on Textbox in WPF/C#

Question

I am currently in the process of creating a Onscreen keyboard. I am handling the button click using routedcommands. The issue is that when i click on the button in keyboard

Answer 1

I had to use this to get my desired result

FocusManager.SetFocusedElement(this, UserNameautoCompleteBox);

Key key = Key.Enter;                    // Key to send
var target = Keyboard.FocusedElement;    // Target element
RoutedEvent routedEvent = Keyboard.KeyDownEvent; // Event to send

target.RaiseEvent(
    new KeyEventArgs(
        Keyboard.PrimaryDevice,
        PresentationSource.FromVisual(UserNameautoCompleteBox),
        0,
        key) { RoutedEvent = routedEvent }
);