You may wanna try customise your controls.
First
In a new vi, insert a boolean control i.e. Square Button. Right click on the control> Advance> Customise...
Sencond
~ Double clicks on the Top-right corner's icon of the panel, edit the icon in accordance to your preferance i.e. EXIT picture etc.
~ CTRL+C to copy your icon to the clipboard, OK the dialog.
~ Go to Edit Mode for the control (TOOL icon button), right click on the center of the Button > Import piture...
By now, a Control with your own created icon is ready for use.
Hope this will help.
happy trying
~ ian.f