• Browser and version:

ie: Chrome 51, IE11

• Version of Leaflet (L.version):

0.7.7, 1.0.0?

• Version of esri Leaflet (L.esri.VERSION):

hello,when i use DynamicMapLayer to loading two layers ,because of layers z-index ,when layer loading ,sometimes a covered b,and sometimes b covered a ,can you give DynamicMapLayer an attribute to set zindex