Since you are using Tk-400.202, it appears that 'perldoc Tk::grid
' should tell you what you need to know. You will probably need to read some other documentation, but:
$master->gridRowconfigure(index?, -option=>value, ...?)
Query or set the row properties of the index row of the geometry
master, $master. The valid options are -minsize, -weight and -pad.
If one or more options are provided, then index may be given as a
list of row indeces [sic] to which the configuration options will operate
on. The -minsize option sets the minimum size, in screen units,
that will be permitted for this row. The -weight option (an
integer value) sets the relative weight for apportioning any extra
spaces among rows. A weight of zero (0) indicates the row will not
deviate from its requested size. A row whose weight is two will
grow at twice the rate as a row of weight one when extra space is
allocated to the layout. The -uniform option, when a non-empty
value is supplied, places the row in a uniform group with other
rows that have the same value for -uniform. The space for rows
belonging to a uniform group is allocated so that their sizes are
always in strict proportion to their -weight values. See THE GRID
ALGORITHM below for further details. The -pad option specifies the
number of screen units that will be added to the largest window
contained completely in that row when the grid geometry manager
requests a size from the containing window. If only an option is
specified, with no value, the current value of that option is
returned. If only the master window and index is specified, all
the current settings are returned in an list of "option-value"
pairs.
As I noted in a comment to the question - this is antique software that should be upgraded.