The FlowDirection property allows you to specify whether the chart should flow right to left or left to right. By default, the C1OrgChart flows left to right. You can change the FlowDirection property to RightToLeft with the following markup:
<c1:C1OrgChart
x:Name="_orgChart"
FlowDirection="RightToLeft"
ItemTemplate="{StaticResource
EmployeeTemplate }" >
</c1:C1OrgChart>