How to display a custom grid (Eg: Indian Grid Reference System) on top of a map? Is it possible to maintain the scale and zoom level of the lines and text?
We don't really have a good solution in the API for building custom grids. One possible idea is you could draw graphics and have a different GraphicsOverlay per zoom level. This could be achieved by setting the mix and max scale of each GraphicsOverlay so that they automatically turn on and off as you zoom in or out - http://developers.arcgis.com/qt/latest/cpp/api-reference/esri-arcgisruntime-graphicsoverlay.html#setMinScale
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