Gets or sets a value that indicates whether to show the thumbs.
Object.defineProperty(AnnEditDesigner.prototype, 'showThumbs',
get: function(),
set: function(value)
)
showThumbs: boolean;
true to show the thumbs; otherwise, it is false. The default value is true.
Some derived classes such as the AnnTextEditDesigner class toggle the value of this property when the text box is in "edit text mode".