##Run this program and see what happens
use Tk;
my $mw = new MainWindow;
my $label = $mw -> Label(-text=>"Hello World") -> pack();
my $button = $mw -> Button(-text => "Quit",
-command => sub { exit })
-> pack();
MainLoop;
####
use Tk;
my $mw = new MainWindow;
my $ent = $mw -> Entry() -> pack();
MainLoop;
##
##
use Tk;
#Global Variables
my $age = 10;
my $gender = "Male";
# Main Window
my $mw = new MainWindow;
#GUI Building Area
my $frm_name = $mw -> Frame();
my $lab = $frm_name -> Label(-text=>"Name:");
my $ent = $frm_name -> Entry();
#Age
my $scl = $mw -> Scale(-label=>"Age :",
-orient=>'v', -digit=>1,
-from=>10, -to=>50,
-variable=>\$age, -tickinterval=>10);
#Gender
my $frm_gender = $mw -> Frame();
my $lbl_gender = $frm_gender -> Label(-text=>"Sex ");
my $rdb_m = $frm_gender -> Radiobutton(-text=>"Male",
-value=>"Male", -variable=>\$gender);
my $rdb_f = $frm_gender -> Radiobutton(-text=>"Female",
-value=>"Female",-variable=>\$gender);
my $but = $mw -> Button(-text=>"Push Me", -command =>\&push_button);
#Text Area
my $textarea = $mw -> Frame();
my $txt = $textarea -> Text(-width=>40, -height=>10);
my $srl_y = $textarea -> Scrollbar(-orient=>'v',-command=>[yview => $txt]);
my $srl_x = $textarea -> Scrollbar(-orient=>'h',-command=>[xview => $txt]);
$txt -> configure(-yscrollcommand=>['set', $srl_y],
-xscrollcommand=>['set',$srl_x]);
#Geometry Management
$lab -> grid(-row=>1,-column=>1);
$ent -> grid(-row=>1,-column=>2);
$scl -> grid(-row=>2,-column=>1);
$frm_name -> grid(-row=>1,-column=>1,-columnspan=>2);
$lbl_gender -> grid(-row=>1,-column=>1);
$rdb_m -> grid(-row=>1,-column=>2);
$rdb_f -> grid(-row=>1,-column=>3);
$frm_gender -> grid(-row=>3,-column=>1,-columnspan=>2);
$but -> grid(-row=>4,-column=>1,-columnspan=>2);
$txt -> grid(-row=>1,-column=>1);
$srl_y -> grid(-row=>1,-column=>2,-sticky=>"ns");
$srl_x -> grid(-row=>2,-column=>1,-sticky=>"ew");
$textarea -> grid(-row=>5,-column=>1,-columnspan=>2);
MainLoop;
## Functions
#This function will be executed when the button is pushed
sub push_button {
my $name = $ent -> get();
$txt -> insert('end',"$name\($gender\) is $age years old.");
}