dlgitem_get
dlgitem_get (window, dlgitem, attribute)
Returns the value of attribute for dlgitem within window as a string.
• window — A window identifier.
• dlgitem — The value of the control's id attribute.
• attribute — The attribute to get. For a list of attributes, refer to
dlgitem_set.
If window is invalid, or if dlgitem does not exist within window, then $ERROR is set and NULL is returned.