- wxIconBundleDefault ctor. 
- AddIconAdds the icon to the collection; if the collection already contains an icon with the same width and height, it is replaced by the new one. 
- GetIconReturns the icon with the given size. 
- GetIconByIndexreturn the icon at index (must be < GetIconCount()) 
- GetIconCountreturn the number of available icons 
- GetIconOfExactSizeReturns the icon with exactly the given size or wxNullIcon if this size is not available. 
- IsEmptyReturns true if the bundle doesn't contain any icons, false otherwise (in which case a call to GetIcon() with default parameter should return a valid icon).