public void SetFormula( string formula, Nullable<CellReferenceMode> cellReferenceMode )
Note: the formula should return a boolean result. When the formula is applied to cells in the region if the formula returns false then those cells will not be included in the formatting.
Target Platforms: Android 4.4+, iOS 8+
Development Environments: Visual Studio 2015+, Visual Studio for Mac Preview, Xamarin for Visual Studio 4.2+