Hello All,
I have an issue with the Tk user interface on windows. I have supplied a sample code to reproduce the problem.

When you launch the code, the window opens up in normal state. now take you mouse to the task bar of an open application until the "tool tip" displays. The Tk UI all disappeared. But click on a different tab or adjust the slider and the Tk UI reappears.

Second, maximuze the TK UI, again take you mouse to the task bar of an open application until the "tool tip" displays. This time the Tk UI disappeared again EXCEPT for the notebook.
I have been playing with pack and grid. I have tried using all pack, using all grid, and using a combination of both with no luck, so I call upon the experts.
Any help you can offer will greatly be appreciated

use strict;
use Tk;
use Tk::SplitFrame;
use Tk::LabEntry;
use Tk::LabFrame;
use Tk::ErrorDialog;
use Tk::NoteBook;
#use Tk::Label;

&maingui;


sub maingui {
    my $MainWindow = MainWindow->new(-title=>'Split Window Example');

    my $SplitFrame = $MainWindow->SplitFrame
       (
        '-orientation' => 'vertical',
        '-trimcolor'  => '#c7c7c7',
        '-background'  => 'white',
        '-sliderposition' => 100,
        '-borderwidth' => 2,
        '-sliderwidth' => 7,
        '-relief'      => 'sunken',
        '-height'      => 1000,
        '-width'       => 1000,
        '-padbefore'   => 0,
        '-padafter'    => 0
       );

    # Values shown above are defaults.

    my $LeftLabel = $SplitFrame->Label ('-text' => 'Left');
    my $RightLabel = $SplitFrame->Label ('-text' => 'Right');
    $SplitFrame->pack (-expand => 'true', -fill => 'both');
    $SplitFrame->configure ('-sliderposition' => 100);

   ###################################################################
+###########
   ##              Right Side of the Split Frame                      
+    ##
   ###################################################################
+###########
    my $nb = $RightLabel->NoteBook()->pack(-expand=>1,-fill=>'both');
    my $tab_1 = $nb->add('one',
             -label => '1.');
    my $tab_2= $nb->add('two',
             -label => '2. ');
    my $tab_3 = $nb->add('three',
             -label => '3. ');

   ###################################################################
+###########
   ##              Tab 1                                  ##
   ###################################################################
+###########
   my $startday;
   my $starthour;
   my $endday;
   my $endhour;
   my $chkoptions;
    my $frm1 = $tab_1->Frame(-relief=>'groove',
              -label=>'SOme text here',
              -borderwidth=>2,
              )->pack(-side=>'top',-anchor=>'nw',-fill=>'both');
            
    my $frm_start = $tab_1->LabFrame(-relief=>'groove',
                -label=>'question here?',
                -labelside=>'acrosstop',
                )->pack(-side=>'top',
                    -anchor=>'nw',
                    -fill=>'both'
                    );

    my $label1 = $frm_start -> Label(-text => 'Between  '
                ) -> pack(-side => 'left' ,
                    -pady =>3
                    );
    my $startday_e= $frm_start->LabEntry(-label=>' day(s)  ',
                      -labelPack=> [qw/-side right/],
                      -background=> 'white',
                      -textvariable=> \$startday,
                      -width=>10,
                      )->pack(-side=>'left',
                          -pady=>3,
                          );
    my $starthour_e= $frm_start->LabEntry(-label=>' hour(s)  and ',
                      -labelPack=> [qw/-side right/],
                      -background=> 'white',
                      -textvariable=> \$starthour,
                      -width=>10,
                      )->pack(-side=>'left',
                          -pady=>3,
                          );

    MainLoop;
}
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