Cannot use SetNuiFocus(true, true) on FXDK

Greetings,

I’v go an UI in my GM,
I tried to use these commands to make appear the mouse and interact with the UI :
SetNuiFocus(true, true);
SetNuiFocusKeepInput(true);

But FXDK doesnt seems to consider mouse call,

Anyone has the same issue ?

Best regards,

This is what i’v tried :
public class ClientMain : BaseScript

{

    bool first_tick = false;

    public ClientMain()

    {

        Debug.WriteLine("Hi from Test.Client!");

    }

    [Tick]

    public Task OnTick()

    {

        if(!first_tick){

            Debug.WriteLine("First tick");

            first_tick = true;

            SetNuiFocus(true, true);

            SetNuiFocusKeepInput(true); //Freeze player

        }

        DrawRect(0.9f, 0.4f, 1.5f, 0.5f, 255, 255, 255, 150);

        return Task.FromResult(0);

    }

}

}