blockIndex[in] Specifies the index of a table block. The index is in the ILayout::VisualBlocks collection.selectedCells[out, retval] Provides access to the returned FRRectangle object which contains the coordinates of the surrounding rectangle of the selected cells. Coordinates are defined in a base grid.
By the base grid here we assume the grid formed by table borders and separators. Each vertical separator increments the horizontal coordinate by one, and each horizontal separator increments the vertical coordinate by one. Coordinate axes are oriented from left to right and from top to bottom.