defines the height of a cell in pixels
webix.ui:({
view:"gridlayout",
id:"grid",
gridColumns:4, gridRows:3,
cellHeight: 150, cellWidth: 200,
cells:[
{ id:"a", template:"Single", x:0, y:0, dx:1, dy:1 },
{ id:"b", template:"Wide 1", x:1, y:0, dx:2, dy:1 }
// more cells
]
});