void MyPLayerUtilityClass::playFileCB(String file)
{
	String cmd("pkill aplay");  // to be sure to stop other sample already playing
	DoSystemCall(cmd.Begin());
	cmd = "aplay ";
	cmd += file;
	cmd += " &";
	DoSystemCall(cmd.Begin());
}


playSoundButton <<= THISBACK1(playFileCB, "path/MySample.wav");