get cell text
returns widget to draw cell at (col, row)
returns column header widget, null if no header
returns row header title
set new size
returns row header widget, null if no header
returns row header title
set cell text
set col header title
set row header title
number of columns
number of columns
number of rows
number of columns
number of columns
number of rows
returns widget to draw cell at (col, row)
returns row header widget, null if no header
returns column header widget, null if no header