fnGetIndexToAdd = function (iControlsAdded) {
								// determines the column(1st, 2nd or 3rd), the next entity data key-value should be added to.
								if (iControlsAdded <= ENTITIES_PER_COLUMN) {
									return FIRST_COLUMN;
								} else if (iControlsAdded <= ENTITIES_PER_COLUMN * 2) {
									return SECOND_COLUMN;
								}
								return THIRD_COLUMN;
							}
Builds the header layout structure.
The header displays the entity data in 3 columns
and each column can consist of 3 key-value pairs at most.
@param {object} oData main control data object source