Message box problem please help.

Question

Dear all. i download http://www.c-sharpcorner.com/ebooks/step-into-windows-10-uwp link is book.example for dialog message.

i have raspberry pi 3 . i make part 5 example, but i have a problem.

run remote machine (my raspberry pi) i can not see dialog message.

run the local machine its work. please help me please.