Form focus doesn't work

I attached to a cell layout a form, but if you click on input it don’t activate the typing. Only works if you click on label.

 var myForm = layout_2.cells("b").attachForm([
{type: "input",    label: "Vertex", name: "vertice",offsetLeft: 13},
{type: "input", label: "  x",      name: "x",offsetLeft: 40},
{type: "input", label: "  y",      name: "y",offsetLeft: 40},
{type: "input", label: "  z",      name: "z",offsetLeft: 40}


What browser (version), OS and DHTMLX version do you use?