// is successful and after the next Layout the item will be resized.
bool SetSpan( const wxGBSpan& span );
// is successful and after the next Layout the item will be resized.
bool SetSpan( const wxGBSpan& span );
bool Intersects(const wxGBSizerItem& other);
// Returns true if the given pos/span would intersect with this item.
bool Intersects(const wxGBSizerItem& other);
// Returns true if the given pos/span would intersect with this item.