private void exportAddressUnitsToSQLITEDbToolStripMenuItem_Click(object sender, EventArgs e)
        {
            var mLyr = ExtFunctions.GetSelectedAddressUnitLayer(theMap);

            if (mLyr == null)
            {
                return;
            }

            var mOpFn = SelectOutputFilename(null, mLyr.LegendText + ".sqlite", "SQLite database|*.sqlite", false);

            if (mOpFn == null)
            {
                return;
            }

            ExtFunctions.ExportToSQLiteDatabase(
                mLyr,
                mOpFn,
                theMap.Projection,
                ExtFunctions.GetProjByEPSG(4326));
        }