* @return The starting x-coordinate for the specified column index.
	 */
	public int getColumnIndexStart(int columnIndex) {
		int pos = getInsets().left;
		for (int i = 0; i < columnIndex; i++) {
			Column column = mModel.getColumnAtIndex(i);
			if (column.isVisible()) {
				pos += column.getWidth() + (mDrawColumnDividers ? 1 : 0);
			}
		}
		return pos;
	}