Gets or sets a value indicating the current extended mode modifier key.
Object.defineProperty(AnnDrawDesigner.prototype, 'extendedModeModifierKey',
get: function(),
set: function(value)
)
extendedModeModifierKey: AnnKeys;
The current extended mode modifier key. The default value is AnnKeys.None.
When this AnnDrawDesigner is drawing an object and the user holds down the key specified by this property, the ExtendedMode is activated.