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UISystem.SetScene(Scene_Menu);
await Task.Delay (9000);
p.Text="HELLO";
await Task.Delay(9000);
p.Text="WORLD";
# 5 ; .:
http://msdn.microsoft.com/en-us/async
DoEvents - , . MSDN:
http://msdn.microsoft.com/en-us/magazine/hh456401.aspx