Maximum width of grid/chart

We insert grid/chart in a td. So, we can have two td’s in a HTML table row.

Is there a way to restrict the maximum size of DHTMLX chart and grid? We will have something like the following:

--> (50% for each) (occupy all row) --> (50% for each) (occupy all row)
Grid1 Chart1
Chart3 Grid3
Grid2(occupy all row) If you need the grid to occupy all the table row you need to build a row with a colspan: Grid2