unsigned char array to callbackdata problem with memset

hello everyone, i'm using CVI 2012 SP1 and i have this problem.

i have a function that load panel and assign an unsigned char array as callback data to the panel and to the timer.

when i use the array with the timer everything seems ok, when i close the panel and make a memset it's seem that the function works but after i find the value in the array.

can you check my code?

i have deleted not necessary code.

p.s. i know i don't need to memset because when i close the panel and the function quit the variable will be deleted from memory but i didn't understand why the callback with memset seems to work but if i check the memory is not reset.

void LoadAlarmPage(void)
{
	int panelAHandle = {0};
	unsigned char byte_all[16] = {0};
	panelAHandle = LoadPanel(0, "allarmi.uir", PANEL_ALL);
	if (panelAHandle < 0)
	{
		return;
	}

	SetCtrlAttribute (panelAHandle, PANEL_ALL_TIMER, ATTR_CALLBACK_DATA, byte_all);
	SetPanelAttribute (panelAHandle, ATTR_CALLBACK_DATA, byte_all);

	if (InstallPopup(panelAHandle) == 0)
	{
		RunUserInterface();
		RemovePopup(0);
	}
	DiscardPanel(panelAHandle);
	return;
}

int CVICALLBACK PanelAlarmCallback(int panel, int event, void *callbackData, int eventData1, int eventData2)
{
	unsigned char *byte_all = callbackData;
	switch(event)
	{
		case EVENT_CLOSE:
			memset (byte_all, 0, 16);
			QuitUserInterface(0);
			break;
	}
	return 0;
}

int CVICALLBACK Gest_All(int panel, int control, int event, void *callbackData, int eventData1, int eventData2)
{
	unsigned char *byte_all = callbackData;
	union S_DB10 *DB10 = {0};
	int i = {0};
	switch (event)
	{
		case EVENT_TIMER_TICK:
			switch (control)
			{
				case PANEL_ALL_TIMER: //
					DB10 = GetPointerToDB10();
					if(memcmp(DB10->byte_all, byte_all, 16) != 0)
					{
						memcpy (byte_all, DB10->byte_all, 16);
                                        }
					ReleasePointerToDB10();
					break;
			}
			break;
	}
	return 0;
}