Resolves the index to use for ordering the legend.
            
            
            
            
            
            
            
            public int ResolveLegendIndex()
             
        
             
        
            
            
            Return Value
The ordering index to use.
 
            
            
            
            
            Target Platforms: Android 4.4+, iOS 8+
Development Environments: Visual Studio 2015+, Visual Studio for Mac Preview, Xamarin for Visual Studio 4.2+