====== behavior: select-dropdown ======

''select-dropdown'' is what is known as //COMBOBOX// in Windows. 

===== Elements =====
that have this behavior applied by default (see [[master style sheet]]): 
  *  ''<select>...</select>'' 
  *  ''<widget type="select"></widget>'' 

In h-smile ''<select>'' can have any arbitrary markup inside but following elements have special meaning:
  *  ''<option>...</option>'' - option element - item of the list.
  *  ''<options>...</options>'' - container of other ''option'' and/or ''options'' - node of the tree. 
  *  ''<optgroup>...</optgroup>'' - container of ''option''s - grouping element.


===== Attributes =====
this behavior knows about:
  * ''size="N"'' - number of visible itemsin the list.
  * ''multiple'' - if defined allows to select more than one item.
  * ''multiple="checks"'' - allows to select more than one item and ''<option>''s rnedered with check marks.  

===== Events =====
Besides of standard set of events (mouse, keyboard, focus) //behavior:select// generates:
  * SELECT_SELECTION_CHANGED event - selection was changed due to user interaction.
  * SELECT_STATE_CHANGED event - state of ''<options>'' (tree node) was changed: collapsed or expanded. Field //target// of event structure is a reference to the node element that was changed.

===== Value =====
  * single selectable lists - value is value of the selected ''<option>'' - either content of //value// attribute or text of the ''<option>''.
  * multi-selectable lists - value is an array of values of selected ''<option>''s.


===== Special key combinations =====

  * LEFT - for nodes, collapse current node (''options'' element);
  * RIGHT - for nodes, expand current node (''options'' element);
  * UP / PAGE-UP - previous item;
  * DOWN / PAGE-DOWN- next item;
  * SHIFT + UP/PAGE-UP - same as above but with selection;
  * SHIFT + UP/PAGE-DOWN - same as above but with selection;
  * HOME - first item in the list;
  * END - last item in the list;

<note>
You can override styles of the ''<select>'' and its content, see [[master style sheet]] and html_samples/forms/selects.htm and nearby.
</note>