defines the panel content (a view or some HTML)
webix.ui({
view:"dashboard",
gridColumns:4, gridRows:3,
cells:[
{ view:"panel", body:{ template:"Single" }, x:0, y:0, dx:1, dy:1},
{ view:"panel", body:{ template:"Wide 1" }, x:1, y:0, dx:2, dy:1},
{ view:"panel", body:{ template:"Wide 2" }, x:0, y:1, dx:2, dy:1}
// more cells
]
});