Font size in a control

On desktop I click in a Properties and in Appearance  tab
there is an option Font Size = Very Large

in My program I have a button
and for this button I use


GUICtrlSetResizing(-1, $GUI_DOCKALL)
GUICtrlSetFont(-1, 8, 400, 0, 'MS Sans Serif')

but this do not help


Question:
Why system change font size in control or How to prevent changing font size in control (button)