/**
* @brief Insert child into the FlexLayout at the given index.
* @param[in] child Actor to insert.
+ * @param[in] margin of child Actor.
* @param[in] measureFunction for the child.
* @param[in] index to insert at.
*/
- void AddChild( Actor child, MeasureCallback measureFunction, int index );
+ void AddChild( Actor child, Extents margin, MeasureCallback measureFunction, int index );
/**
* @brief Remove child from the FlexLayout at the given index.