//by default all are present. ('l' stands for left, 't' stands for top, etc.)
elements['element_1'].putClientProperty(CLIENTDESIGN.HANDLES, new Array('r', 'l')); // other options are 't', 'b', 'r', 'l', 'bl', 'br', 'tl', 'tr'
SELECTABLE
Property that can be set using elements['element_1'].putClientProperty(...), it sets the selectable flag in clientdesign