change&gt; event.</td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#mxGraphSelectionModel.getFirstSelectableCell" id=link23 onMouseOver="ShowTip(event, 'tt17', 'link23')" onMouseOut="HideTip('tt17')">getFirstSelectableCell</a></td><td class=SDescription>Returns the first selectable cell in the given array of cells.</td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#mxGraphSelectionModel.addCell" id=link24 onMouseOver="ShowTip(event, 'tt18', 'link24')" onMouseOut="Hid