class VirtualField : public Convert
{
private:
	int col;
	GridData *map;
public:
	VirtualField(int aCol, GridData *pMap)
	{
		col = aCol;
		map = pMap;
	}

	virtual Value Format(const Value& q) const
	{
		return map->Get(col, q); // Convert index to value when showing.
	}
};

class VirtualEdit : public Convert
{
private:
	int col;
	GridData *map;
	ArrayCtrl *array;
public:
	VirtualEdit(int aCol, GridData *pMap, ArrayCtrl *pArray)
	{
		col = aCol;
		map = pMap;
		array = pArray;
	}

	virtual Value Format(const Value& q) const
	{
		return map->Get(col, array->GetCursor()); // Edit always at cursor, so return value to edit.
	}

	virtual Value Scan(const Value& text) const
	{
		map->Set(col, array->GetCursor(), text); // Store value after edit.
		return text;
	}
};

class CANtrakTexts : public WithCANtrakTextsLayout<TopWindow> {
private:
	Array<EditString> edits;
	Array<Convert> converts;
	GridData map;

....

void CANtrakTexts::PopulateGrid()
{
	text_grid.Reset();
	edits.Clear();
	converts.Clear();
	for (int i=0 ; i < map.GetColumnCount() ; i++)
	{
		edits.Add().SetConvert(converts.Add(new VirtualEdit(i, &map, &text_grid)));
		text_grid.AddRowNumColumn(map.GetColumn(i), 180).Edit(edits[edits.GetCount()-1]).SetConvert(converts.Add(new VirtualField(i, &map)));
	}
	text_grid.SetVirtualCount(map.GetRowCount());
}