[amibroker] GetCursorXPosition

[spi_maker]

I'm having trouble with GetCursorXPosition/GetCursorYPosition.

Clicking on the panel definitely registers, but I'm getting null values 
returned for x, y, px & py.

Regardless of whether I do it in an if (as in the example below) or as a 
function EventHandler(), I am still getting nothing returned from the 
GetCursorPosition.

Any ideas what might be going astray here?

Thanks in advance

if( GetCursorMouseButtons() & 1)
{
        // retrieve co-ordinates in date/value units
        x = GetCursorXPosition(0);
        y = GetCursorYPosition(0);

        // retrieve co-ordinates in pixel units
        px = GetCursorXPosition(1);
        py = GetCursorYPosition(1);

        // Convert the xy coordinates into Row Column coordinates
        MouseCol = floor( px / CellWidth );
        MouseRow = floor( py / CellHeight );

        printf("Left mouse button is pressed down\n");
        printf("MC " + MouseCol + " BC " + ButtonCol + " MR " + MouseRow + " BR 
" + ButtonRow + "\n");
        printf("x " + x + " y " + y + "\n");
        printf("px " + px + " py " + py + "\n");
}