[VB]	Public Sub setOverlapRatio(overlapRatio As Double [, firstOnTop As Boolean ])
[C#]	public void setOverlapRatio(double overlapRatio [, bool firstOnTop ]);

Sets overlapping among bars in within a bar group in a multi-bar chart.

By default, in a multi-bar chart, the bars are not overlapped, but are separated with a gap in between. This method can be used to set an alternative style, where the bars partially overlap.

Argument	Default	Description
overlapRatio	(Mandatory)	The overlapping ratio between adjacent bars in a bar group. Should be between 0 to 1.
firstOnTop	true	If this value is true, the first data set will be on top of the second data during overlapping, and the second data set will be on top of the third data set, and so on. If this value is false, then the overlapping order will be reversed.

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