[SOLVED] Very Strange: GUICtrlCreateLabel sometime show text, sometime not

Hi,
I have a very strange behaviour of GUICtrlCreateLabel: it sometime show label, sometime it doesn't.
I try to trap it using msgbox and everytime the msgbox is get executed so there is no reason the GUICtrlCreataLabel doesn't.

If $price_found = True then
$display_price = GuiCtrlCreateLabel("Price is : " & NumberCommas($price), 250, 60, $SS_NOTIFY)
;msgbox (0,0,"this message box is executed everytime")
endif

Tested with $SS_NOTIFY and without.

What is the logic explanation for this and how to solve this?

Thanks! :-)