Here's one way.
int CVICALLBACK ClearTable (int panel, int control, int event,
void *callbackData, int eventData1, int eventData2)
{
int RowCount;
switch (event)
{
case EVENT_COMMIT:
GetNumTableRows (panelHandle, PANEL_TABLE, &RowCount);
if (RowCount > 0) {
DeleteTableColumns (panelHandle, PANEL_TABLE, 1, -1);
DeleteTableRows (panelHandle, PANEL_TABLE, 1, -1);
}
break;
}
return 0;
}