After upgrading Devexpress VCL from 18.2.5 to 19.1.2, in order to use the latest functions and especially the new grid Excel filtering mode, but unfortunately, the compiler didn't recognize some constants and properties, like the dxDefaultFilterPopupWindowMode constant and .Filtering.ColumnPopupMode property of DBGridViews. In spite of putting dxFilterPopupWindow in the uses clause.
Any help ?
Finally, This error occurred because I left the path of the previous version in the Delphi library path, and it was before the path of the new version. So, I deleted the 1st one and I kept the new one. Et voila, all things runs well now :):):)