mxCell is selected.</div></div><div class=CToolTip id="tt12"><div class=CClass>Cells are the elements of the graph model. </div></div><div class=CToolTip id="tt13"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">mxGraphSelectionModel.prototype.isEmpty = function()</td></tr></table></blockquote>Returns true if no cells are currently selected.</div></div><div class=CToolTip id="tt14"><div class=CFunction><blockquote><table border=0 cel