Help with DllImport and Canvas

[marktech]

Hello, I'm having some problems and don't know if this is the expected behavior.

1. When using some functions from DllImport like below, when the script ends it restores the original value, if this is the expected behavior, how I do not restore?.
 

Code:

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[DllImport("ntdll.dll")]
static extern uint NtSetTimerResolution(uint DesiredResolution, bool SetResolution, out uint CurrentResolution);

2. I tried to place a canvas above all controls in wpfBuilder to show a dialog or message (like the example below) without success. Is it possible with wpfBuilder?