Looks like there's no built-in option to disable/remove the InputBox/TextCtrl part in wx.lib.filebrowsebutton.FileBrowseButton, well I did come up with a workaround which is simply set labelText to blank and then size it down to fit only the button itself, this way visually you can tell no difference from a normal button, but I don't think it's nice enough to go with.
So is there a way to fully disable/remove the InputBox part? Or maybe a way to bind normal button with file browser function?