Quick answer: Plate Bounderies.
remove quick launch icons and again include them..if it does not work,restart the computer after removing the quick launch and then toggle it on...
Hold down the cntl key and drag the icon to the quick launch bar. This will copy the icon. If you don't hold the cntl key it will move the icon to the quick launch bar.
homes building
To restore the Show Desktop in the Windows Quick Launch Toolbar one should ensure that the settings are configured to enable Show Quick Launch. Alternatively one can go to the Microsoft website, navigate to this problem and press the Fix It button.
play with regedit
The button is included by default in the Quick Launch menu. Simply right-click the taskbar and select Toolbars > Quick Launch.
Thanks
Task Properties.
Quick Launch
bible toolbar
Quick launch toolbar